Nature — France — NextOnTrip

Grotte de Lamartine

Bourdeau

Grotte de Lamartine is a small cave on the western shore of Lac du Bourget, in the commune of Bourdeau in Savoie, tucked at the foot of the Mont du Chat massif. Its fame has little to do with size and everything to do with literary history: this is where the French poet Alphonse de Lamartine spent time with his beloved Julie Charles in 1816, and where, a year later, alone and grieving her absence, he wrote "Le Lac" ("The Lake"), one of the defining poems of French Romanticism. For anyone interested in literature or a quiet lakeside view, it remains one of the most symbolic spots on Lac du Bourget. What is actually inside the cave? Despite the singular name, the site consists of two shallow rock cavities carved into Urgonian limestone, each only a few metres deep. This is not a cave to explore underground — it is better described as a sheltered rock niche above the water, fronted by a small pebble beach. The scale is intimate: a place to pause and look out, not a network of passages to walk through. Why is this cave named after Lamartine? The name comes from poet Alphonse de Lamartine, who met Julie Charles — the woman he immortalized in his poetry as "Elvire" — near Lac du Bourget in 1816. The two spent time together close to this cave, taking in the view of the lake. When he returned alone the following year, he wrote "Le Lac," a meditation on lost time, memory, and the unchanging permanence of nature against the fleetingness of human happiness. The poem became a cornerstone of French Romantic literature, and the site of its inspiration still draws visitors curious about its literary roots. How do you get there, and what should you expect? The approach follows a narrow, uneven path branching off the road near the port of Bourdeau, running along the edge of a modest drop. Reaching the cave takes roughly ten minutes and involves a descent of several dozen metres. The path has steep, rocky stretches, so sturdy footwear and caution are advisable, particularly after rain. It is not suited to wheelchairs or visitors with limited mobility. What views does the site offer? The view is really the main reason to make the trip. From the approach path and from the cave niche itself, you get a sweeping panorama over Lac du Bourget and the surrounding hills, including the direction of Chambotte and Revard, and on clear days the more distant peaks of the Belledonne range. At sunrise and sunset, the changing light over the water and rock face draws photographers and anyone looking for a quieter alternative to the lake's busier beaches. Who is this spot for? Grotte de Lamartine suits visitors who enjoy a short but moderately demanding walk rewarded with a view and a piece of literary history. It is not a family attraction with built-up tourist infrastructure — there are no ticket booths, large information panels, or food stalls on site. Bring comfortable shoes and time your visit for the hours when the light best sets off the lake landscape. FAQ Is Grotte de Lamartine a real cave you can explore? Not in the sense of an extensive underground system — it is two shallow rock cavities. The appeal lies in the view and the literary history, not in cave depth. How long does it take to reach it? The descent from the road near the port of Bourdeau takes about ten minutes; the walk back up takes a little longer due to the climb. Is the trail difficult? The path is narrow and uneven, running along the edge of a modest drop, so caution and proper footwear are recommended, especially in damp conditions. Why is the cave linked to Alphonse de Lamartine? The poet spent time here with Julie Charles in 1816, and returned a year later to write "Le Lac," one of the most celebrated poems of French Romanticism. What can you see from the cave? A panorama over Lac du Bourget and the surrounding hills, looking toward Chambotte and Revard, with the Belledonne massif visible on clear days.

Lac glaciaire de Bionnassay

Saint-Gervais-les-Bains

Lac glaciaire de Bionnassay is a small proglacial lake fed by the Bionnassay Glacier, sitting in the commune of Saint-Gervais-les-Bains (Haute-Savoie) at the heart of the Mont Blanc massif. The lake forms directly from glacial meltwater and changes shape and size through the season, a common trait of lakes fed straight from an active glacier. Where exactly is the lake? The lake lies above the hamlet of Bionnassay (around 1,320 m altitude), along the approach toward Nid d'Aigle and the glacier front. Its outflow runs down the valley as a mountain stream that eventually joins the Bon Nant river. How did this glacial lake form? The lake sits right at the foot of the glacier's tongue, in the zone where the ice is melting and retreating. Rocks and boulders carried by the moving ice occasionally break loose from the glacier front and fall into the water, so the immediate surroundings call for caution. The lower part of the glacier is often covered in rock debris, which changes its appearance from one season to the next. What is the Bionnassay Glacier itself? The Bionnassay Glacier covers roughly 430 hectares and stretches close to 5 km, making it the smallest of the major glaciers on the French side of Mont Blanc. Its tongue ends between two prominent lateral moraines, visible from several viewpoints reachable from Saint-Gervais Mont-Blanc. How do you get there? The easiest way in is the Tramway du Mont-Blanc (TMB), the highest railway line in France. It links the Saint-Gervais–Le Fayet station (580 m) with the Nid d'Aigle station (2,372 m), from where hiking trails continue toward the glacier. A short viewpoint loop takes about an hour round trip and is rated easy. A longer descent along the moraine, closer to the glacier front, takes roughly an hour and a half and is more demanding, with sections secured by ladders. Hikers can also connect to the GR5 trail toward Bellevue, and the route includes a suspension footbridge over a glacial stream. What should you know before setting off? This is high-mountain terrain right at the front of an active glacier, so conditions and trail access shift from season to season, and falling rock near the ice front is a real possibility. The route toward Nid d'Aigle runs seasonally; it is worth checking the tramway's current operating dates and trail conditions with the Saint-Gervais tourist office before heading up. Frequently asked questions How do you reach the Bionnassay glacier and its lake? The simplest way is the Tramway du Mont-Blanc from Saint-Gervais–Le Fayet station to Nid d'Aigle, then on foot along the viewpoint trails. Is it safe to get close to the lake? The area right at the glacier front calls for caution, since rocks can occasionally fall from the moving ice. Stick to marked trails and viewpoints. How long does the hike to the glacier viewpoint take? The short, easy viewpoint loop takes about an hour round trip; the longer descent nearer the glacier front takes around ninety minutes and requires better fitness. Is the Bionnassay Glacier a large one? It covers about 430 hectares and runs almost 5 km long — the smallest of the great glaciers on the French side of Mont Blanc, though its wild setting still makes a strong impression. Where does the lake's water go? It drains through a mountain stream down the valley that joins the Bon Nant river.

Lac des Cordes

Cervières

Lac des Cordes is a small mountain lake in the commune of Cervières, in the Hautes-Alpes department, within the Briançonnais region of southeastern France. Sitting at 2,446 metres above sea level, right below the northern face of the Pic de Rochebrune, it covers a modest 0.02 square kilometres — closer to an alpine tarn than a large lake — yet its dramatic rock backdrop makes it one of the more rewarding day hikes above the Cerveyrette valley. Where exactly is the lake? The lake sits in a side valley of the Cerveyrette torrent, on land belonging to Cervières, a few kilometres from Briançon. The surrounding terrain is classic high-Alpine: steep slopes, scattered larch woodland thinning out toward the rockline, and the sheer face of the Pic de Rochebrune rising almost directly above the water. Its altitude keeps it snowbound for much of the year, so a visit is realistically limited to summer and early autumn. How do you reach Lac des Cordes on foot? Most walkers start from the hamlet of Les Chalps, leaving the car at the Bourgea parking area. From there the trail first drops toward the Cerveyrette torrent, crossed on a footbridge. Beyond the bridge comes the toughest stretch: a steep, switchbacking climb through forest, including one short passage across a rock face fitted with a safety cable. After that obstacle the path threads past the last larches, levels out, and crosses a boggy alpine meadow before reaching the lakeshore. The outing calls for a reasonable level of fitness and sure footing, though no climbing gear is needed. Is the area protected? Yes. Lac des Cordes lies within the Natura 2000 site known as "Rochebrune – Izoard – Vallée de la Cerveyrette," which safeguards a mix of forest, wetland and alpine pasture habitats. Visitors are asked to stay on marked paths, keep dogs on a leash, and carry out any rubbish. Tent camping and lighting fires are both prohibited, though a single night's bivouac without a tent is tolerated. Frequently asked questions How high up is Lac des Cordes? The lake lies at 2,446 metres above sea level, immediately below the northern face of the Pic de Rochebrune. How big is the lake? Its surface area is about 0.02 square kilometres, making it a small alpine lake rather than a large body of water. Where does the hike start? Most hikers begin at the Bourgea parking area near the hamlet of Les Chalps, in the commune of Cervières. Is the trail difficult? The approach includes a steep, switchbacking forest climb and a short cabled passage across a rock face, so it demands decent fitness, though no technical climbing skills. Can you swim or camp there? Because the site sits within a Natura 2000 protected area, tent camping and fires are banned; only a single night's unsheltered bivouac is allowed, and visitors should keep to the marked trails.

Lac de Viry

Viry

Lac de Viry is a body of water in the commune of Viry, in the Haute-Savoie department, on the French side of the Geneva borderland (the Genevois area), close to the Swiss frontier and not far from Saint-Julien-en-Genevois. Where exactly is Lac de Viry? Viry is the largest commune by area in the canton of Saint-Julien-en-Genevois, bordering Vers, Saint-Julien-en-Genevois and Feigères, roughly 18 km southwest of Annemasse. This stretch of the Franco-Swiss border is rural and gently rolling — fields, woodland and low hills at the foot of the Vuache range. Along the boundary with neighbouring Valleiry runs the Grands Bois forest, one of the larger wooded areas on the French side of the Geneva conurbation. What is there to know about the surrounding area? This corner of Haute-Savoie is mainly a destination for walkers and horse riders: dozens of marked trails fan out within a few kilometres of Viry, some with GPS tracks, following old paths through the Pays du Vuache and the Grands Bois forest. The commune also has a local angling tradition, with stocked ponds holding rainbow trout and cyprinid species, typical of the rural parts of Haute-Savoie. Lac de Viry should not be confused with similarly named lakes elsewhere in France — for instance in the Jura department or near Paris — which are entirely separate places despite the shared name. How far is it from Geneva? Viry sits practically on the outskirts of the Geneva conurbation, on the French side of the border. Driving to central Geneva or to Saint-Julien-en-Genevois typically takes no more than half an hour, making the area a convenient base for anyone living or working on either side of the frontier. Frequently asked questions Can you swim at Lac de Viry? There is no confirmed information about an official supervised bathing area here — for swimming, it is worth checking directly with the commune or the wider Geneva region for current options. Can you fish nearby? Yes, the commune of Viry has angling ponds stocked with rainbow trout and cyprinid species, popular with local anglers. How far is Geneva? About fifteen kilometres — a drive of roughly fifteen to thirty minutes depending on the route and border traffic. Is this the same Lac de Viry as the one in the Jura or near Paris? No. This is a separate body of water in the commune of Viry in Haute-Savoie — the name coincides with other lakes in France, but they are different places.

Lac de Souliers

Château-Ville-Vieille

Lac de Souliers sits at roughly 2,492 metres above sea level in the commune of Château-Ville-Vieille, within the Queyras Regional Nature Park in the Hautes-Alpes. Locals call it "l'œil du Queyras" — the eye of Queyras — a nod to its striking, near-perfect circular outline set against green alpine pasture. What makes the shape so unusual? The lake didn't form the way most alpine tarns do. It sits inside a sinkhole created by the slow dissolution of an underground gypsum deposit, which left behind a funnel-shaped hollow that eventually filled with water. That geological quirk — uncommon in this part of the Alps — is exactly why the shoreline reads as such a clean circle rather than the jagged edges typical of glacial lakes. The setting Open grassy slopes surround the water on every side, grazed by cattle and sheep through the summer months. The panorama stretches across the wider Queyras massif, and on a clear day the distinctive peak of Mont Viso, the highest summit of the Cottian Alps, is visible from the shore. Because the site sits exposed to wind at altitude, it can feel noticeably cooler here than down in the valley, even in July. How to get there Two main hiking approaches lead to the lake, each starting from a different side of the massif. From the hamlet of Souliers The trailhead is by the Chapelle Saint-Pierre in Souliers, reached via the D544 (off the D902/D947 from Guillestre). The path climbs through forest before steepening toward the Col du Tronchet, then descends alongside the stream that flows out of the lake. It's a family-friendly walk without technical difficulty, though some stretches are fairly steep, and the climb takes about 2 hours 20 minutes one way. There are no water sources along the route, so it's worth carrying enough to drink. From Col d'Izoard A shorter option starts at the Casse Déserte car park near the Col d'Izoard, on the Arvieux side. With under 300 metres of elevation gain, the walk takes less than an hour — the quickest way to reach the lake, and a popular choice for families with children. When to visit The lake is fully accessible from July through September, once the snow has cleared and the surrounding pastures turn green. This is when the area is busiest with hikers stopping for a picnic or a rest during longer treks through Queyras. Frequently asked questions How high up is Lac de Souliers? The lake lies at approximately 2,492 metres above sea level. Why is it called the "eye of Queyras"? Because of its near-perfectly round shape, best appreciated from above or from the surrounding slopes. Which route is easier? The approach from Col d'Izoard (Casse Déserte car park) is shorter and gentler — under an hour of walking with less than 300 metres of elevation gain. The hike from Souliers takes longer, around 2 hours 20 minutes, and includes steeper sections. Is it suitable for families with children? Yes, both routes are considered manageable for families, though it's worth bringing enough water and warm layers given the wind at altitude. Can you swim in the lake? Given the altitude, wind exposure and cold water, the lake is best treated as a scenic stop and picnic spot rather than a swimming destination.

Lac Vert

Névache

Lac Vert is a small mountain lake sitting at roughly 1,830 metres above sea level in the commune of Névache, in the Hautes-Alpes department of France. It lies in the Vallée Étroite, a side valley branching off the Clarée valley right next to the Italian border — a strip of land that actually belonged to Italy until the 1947 peace treaty transferred it to Névache. The lake is known for its strikingly bright green water, a colour produced by algae that grow in the shallow basin. Combined with the surrounding forest and peaks, that colour has made the short walk to Lac Vert one of the more popular outings in the Clarée valley. How do you get to Lac Vert? The walk starts at the hamlet of Granges de la Vallée Étroite, reached by road from Névache toward the Col de l'Échelle. The trail is signposted and rated easy: depending on which version of the route is followed, the one-way walk takes anywhere from around 45 minutes to a little over an hour, with total elevation gain ranging from roughly 100 to under 200 metres. The path runs partly through forest, crosses a wooden footbridge over the stream running through the Vallée Étroite, and opens onto a view of the lake on the final stretch. What should visitors know before going? Because the distance and elevation gain are modest, the walk is a common choice for families, and many visitors bring food for a picnic on the shore. It is worth knowing, though, that the Névache municipality bans swimming and any water activities — including rafts, kayaks, or similar equipment — on all lakes within its territory, Lac Vert included. The lake is therefore a destination for viewing rather than for time spent in the water. What can be seen around the lake? From the approach trail and the lake's surroundings, hikers get views of several nearby peaks, including Mont Thabor and Grand Séru, as well as a group of summits known locally as the Rois Mages. Vegetation along the path is typically alpine, with valerian, buttercups, and various geranium species flowering through the summer months. Despite the trail's popularity, the area around the lake has kept the untouched feel typical of the high valleys around Clarée. When is the best time to visit? Summer is the best season for the walk, once the trail is clear of snow and the alpine plants are in full bloom. In spring and early summer, patches of snow can still linger at higher points along the route, which is worth checking in advance, especially for anyone planning to continue further into the Vallée Étroite. FAQ Where exactly is Lac Vert located? The lake lies in the commune of Névache, within the Vallée Étroite, a side valley off the Clarée valley in the Hautes-Alpes department, close to the French-Italian border. Why is the water green? The lake's distinctive colour comes from algae that grow in its waters. Can you swim in Lac Vert? No. The Névache municipality prohibits swimming and other water activities on all lakes within its boundaries. Where does the trail to the lake start? The walk begins at the hamlet of Granges de la Vallée Étroite, accessed by road from Névache. Is the hike suitable for children? Yes. Its short distance and limited elevation gain make it a popular choice for a family walk that ends with a picnic by the lake. Which peaks are visible from the area? The route and the lake's surroundings offer views of Mont Thabor, Grand Séru, and the summits known as the Rois Mages.

Lac des Brenets

Villers-le-Lac

Lac des Brenets, called Lac de Chaillexon on the French side, is a lake straddling the border between France and Switzerland, carved into the course of the river Doubs between Villers-le-Lac in the Haut-Doubs and the Swiss town of Les Brenets in the canton of Neuchâtel. It is one of the defining landscapes of the Jura border country: a narrow, winding stretch of water framed by forested limestone cliffs, shared and enjoyed equally by visitors from both countries. How did this cross-border lake form? The hollow occupied by the lake was shaped by glacial movement, and the lake itself came into being when a rockslide, roughly 12,000 years ago, dammed the Doubs valley naturally. Since then the river has pooled at this spot before continuing its course further downstream. The water is arranged into three basins, the lower two of which are known together as the Gorges du Doubs, where the channel narrows between steep, wooded cliffs rising to around 50 metres. Why does the water level change so much? The lake is fed solely by the Doubs, so its level tracks rainfall and snowmelt directly. Discharge can range from almost nothing to more than 300 cubic metres per second, and during prolonged dry spells the lake bed has been known to appear almost entirely, with the water nearly disappearing — this happened notably in 2018 and 2022. The phenomenon draws attention on both sides of the border whenever it occurs. What lies at the far end of the lake? At its downstream end, the Doubs plunges over the Saut du Doubs, a waterfall around 27 metres high. The site holds Grand Site National status and ranks among the most visited natural landmarks of the Franche-Comté region. A few hundred metres away, a bridge links the French and Swiss shores, allowing an informal crossing between the two countries on foot. How can visitors explore the lake and the waterfall? Electric sightseeing boats with an open upper deck depart from Villers-le-Lac, running narrated cruises along the meanders of the Doubs and across the lake itself. The round trip covers roughly 14 kilometres; a cruise without a stop takes about an hour, while a version that pauses at the viewpoints above the Saut du Doubs takes around two hours and fifteen minutes. Visitors who prefer to walk can reach the falls from the Vions car park via a marked trail of about 5 kilometres round trip with roughly 200 metres of elevation gain, leading to a series of viewpoints over the basins and the cascade. The long-distance GR5 trail also passes through the area, popular with hikers crossing the Jura. What happens on the lake in winter? When temperatures drop, the frozen surface of Lac des Brenets turns into a natural ice rink, locally described as one of the largest in Europe. Residents of Villers-le-Lac and Les Brenets keep a close eye on ice thickness to judge whether skating is safe; depending on the winter, the skating season can last anywhere from a handful of days to a few dozen. Frequently asked questions Are Lac des Brenets and Lac de Chaillexon the same lake? Yes. It is a single body of water — the Swiss name, Lac des Brenets, refers to the canton of Neuchâtel side, while the French name, Lac de Chaillexon, refers to the Villers-le-Lac side. Which river forms the lake, and where does it go afterward? The lake sits on the river Doubs; downstream of it, the water drops over the Saut du Doubs waterfall and continues its course further into France. Can you cross to the other country on foot here? Yes, a bridge over the lake connects the French and Swiss banks, and pedestrians can cross without a formal border check at this point. Does the lake always stay full? No — because the Doubs' flow varies so much, the water level can drop sharply, and in extreme dry periods the lake has nearly dried up entirely. Can a boat trip reach the waterfall itself? Yes, cruises departing from Villers-le-Lac head toward the Saut du Doubs, with an option to stop near the viewpoints overlooking the falls.

Lac de Belledonne

Allemond

Lac de Belledonne is a mountain lake in the commune of Allemond, tucked into the Eau d'Olle valley at the foot of the Grand Pic de Belledonne, on the southern flank of the Belledonne range in the Isère department of the French Alps. Sitting at roughly 2,160–2,170 metres above sea level, it covers a modest surface of under two hectares, making it a compact but strikingly scenic destination in this part of the Alps. Where is Lac de Belledonne located? The lake sits within the Belledonne massif, a mountain chain stretching around 60 km between the Isère and Romanche valleys and 10 to 15 km wide. Its highest point, the Grande Lance de Domène, reaches 2,977 metres, and the range counts more than 50 summits above 2,500 metres. The massif is built mainly of crystalline rock — granite, gneiss and schist — giving the landscape a rugged, mineral character offset by spruce forest and alpine pasture lower down. How do you reach the lake? The usual starting point is the car park at Coteyssard, above Allemond, reached via the local road known as La Traverse, with parking near the Dreyta stream at about 1,275 metres. The round-trip hike covers roughly 11 km with about 916 metres of elevation gain, putting it in the "difficult" category. Walkers typically need around 4 hours there and back. The trail climbs through distinct bands of vegetation: forest first, then a stop near the Cabane du Chazeau hut, followed by mountain pasture, and finally a stretch of scree with a purely mineral feel just before the lake itself. What can you see around the lake? The setting is wild and dramatic — the lake lies in the shadow of surrounding peaks, with views toward the Croix de Belledonne ridge and, across the valley, the Grandes Rousses and Rissiou massifs. That contrast between bare rock at altitude and the still water below is what draws hikers looking for a quieter alternative to the busier lakes elsewhere in the French Alps. When is the best time to visit? Spring is generally considered the best season, when patches of snow still linger around the shoreline and add to the scenery. Because of its altitude, the lake can remain partly frozen well into early summer, so it is worth checking current snow conditions before setting out, particularly in May and June. FAQ Is Lac de Belledonne the same lake as Lac de la Sagne in Allemond? No. Both lie within the same commune of Allemond, but they are separate lakes with different locations and character — they should not be confused with one another. How long does the hike to the lake take? The full round trip typically takes about 4 hours, covering roughly 11 km with around 916 metres of elevation gain. Is the trail suitable for beginners? The route is rated difficult due to its length, elevation gain, and the final scree section, so prior mountain hiking experience is recommended. Where's the best place to start the hike? The standard starting point is the car park at Coteyssard above Allemond, reached via the La Traverse road, with additional parking near the Dreyta stream at about 1,275 metres. Does the lake freeze? Given its altitude, the surface can stay partly covered in snow and ice into early summer.

Lac de Bracca

Bastelica

Lac de Bracca is a small mountain lake in the commune of Bastelica, in the Corse-du-Sud department of France, set high in the Monte Renoso massif in the interior of Corsica. Sitting above 2,000 metres, it ranks among the highest lakes on the island, cradled by bare granite ridges typical of Corsica's high country above the treeline. Where is Lac de Bracca? The lake lies roughly 40 kilometres northeast of Ajaccio, within the Monte Renoso massif — a range whose highest point reaches 2,352 metres and stands as one of the defining peaks of central Corsica. Its coordinates are approximately 42.0494 N, 9.115 E. The lake itself is unusually shaped, curving into a horseshoe around a small granite outcrop that juts out near its centre. Its surface area is modest — under one hectare — giving it an intimate, secluded feel despite the dramatic high-altitude setting around it. How do you get there? Access to Lac de Bracca is by way of the Col de Scalella, and the route is considered demanding: steep, rocky, and largely exposed to sun and wind for most of the walk. It is not a beginner's outing — solid fitness, proper hiking boots, and enough water, food and windproof layers are essential, along with a realistic time budget. Because of the altitude and terrain, weather can turn quickly, so the best window for a visit runs from late spring through early autumn; outside that period, snow can still cover the higher sections of the trail. What else is there to see nearby? The Monte Renoso massif is known for a handful of glacial lakes, and Lac de Bracca is one of them, alongside the more widely known Lac de Bastani. The area also offers ridge routes toward summits such as Punta alla Vetta, from which walkers get sweeping views over the Pozzi cirque and neighbouring peaks, including Monte Torto. For travellers used to Corsica's coastline, this inland, high-mountain scenery offers a genuinely different side of the island. Who is this hike suited for? Given the altitude, the absence of any facilities, and the rugged terrain, a trip to Lac de Bracca suits experienced mountain hikers comfortable with unmarked or lightly marked high-altitude paths. It is not a suitable destination for families with young children or for anyone looking for a short, easy stroll. FAQ Where exactly is Lac de Bracca located? In the commune of Bastelica, Corse-du-Sud department, within the Monte Renoso massif in central Corsica, about 40 km northeast of Ajaccio. How high up is the lake? It sits above 2,000 metres, making it one of the highest lakes in Corsica. What is the usual route to reach it? The best-known approach goes via the Col de Scalella, a steep and demanding trail suited to experienced hikers. When is the best time to visit? Late spring through early autumn, when the trail is generally free of snow and mountain weather is more stable. Are there other lakes nearby? Yes — the Monte Renoso massif holds several glacial lakes, including the better-known Lac de Bastani.

Lac de Fontaine

Vacheresse

Lac de Fontaine is a small mountain lake in the commune of Vacheresse, in the Abondance valley, at the heart of the Chablais massif in Haute-Savoie, France. Sitting at an altitude of around 1330 metres and covering roughly one hectare, it is a modest, quiet body of water — small enough to feel intimate, yet easy enough to reach that it draws a steady trickle of walkers, anglers and cyclists through the warmer months. How do you get there? A road climbs from the centre of Vacheresse toward the Chalets de Bise and the Bise-Ubine valley, and it leads right past the lake — about 2 km from the village, with free parking on site. Access depends heavily on snow cover: the road is generally usable from May to mid-November, and closed or impassable outside that window. What is the lake like? Lac de Fontaine is a marshy, wetland-type mountain lake, ringed by forest and pasture to the west of the Cornettes de Bise massif. Its aquatic environment is fragile, so swimming is discouraged here — the point of a visit is really the walk around the shore and a look at the surrounding wetland vegetation, not a dip. A flat, easy path circles the lake, and from there a gentle onward walk leads to the Chalets de Bise. Can you fish here? Yes — the lake is popular with anglers. Its waters hold brown trout, rainbow trout, and minnow, species typical of cool, high-altitude Alpine lakes like this one. What hiking routes start from the lake? Lac de Fontaine works well as a base for several hikes into the Chablais massif. From here, a route climbs toward Pointe de Bénévent (2069 m) — a more demanding outing across pasture and rocky terrain suited to reasonably fit walkers. A gentler option is the loop through the Semy and Bouaz pastures, which on a clear day opens up views over Lake Geneva. Another path sets off from the same area toward Lac de Darbon — a separate lake in the same commune of Vacheresse, reached via the Darbon pastures. It's worth being clear that these are two distinct lakes that simply share a nearby starting point and some overlapping trails, not the same body of water under two names. Is it suitable for a bike ride? The lake can also be reached by road bike or mountain bike. The climb from central Vacheresse follows a fairly steady, moderate gradient rather than sharp ramps, which makes it a manageable — if still uphill — outing for cyclists with average fitness. FAQ How high up is Lac de Fontaine? It sits at around 1330 metres above sea level, within the commune of Vacheresse. Can you swim in the lake? No — swimming is discouraged to protect the lake's fragile wetland ecosystem. Is the lake accessible year-round? No. Access depends on snow conditions and is generally possible from May to mid-November. Is Lac de Fontaine the same lake as Lac de Darbon? No. They are two separate lakes within Vacheresse, linked by a hiking trail that crosses the Darbon pastures. Is fishing allowed? Yes, the lake is popular with anglers, who come for brown trout, rainbow trout and minnow.

Lac de la Noire

Saint-Paul-sur-Ubaye

Lac de la Noire is a high-altitude lake sitting at 2,887 m in the commune of Saint-Paul-sur-Ubaye, in the Haute Ubaye valley (Alpes-de-Haute-Provence). It rests on the western flank of Tête des Toillies (3,175 m), right beside the Col de la Noire, in the borderland between the Ubaye valley and the Queyras — just a few kilometers from Italy. It remains one of the quieter lakes in this part of the Southern Alps, favored by hikers looking to escape the busier trails of the valley. Where exactly is the lake? Lac de la Noire lies in the high-mountain terrain surrounding the Chambeyron area, on the boundary between Alpes-de-Haute-Provence and Hautes-Alpes. Its coordinates are roughly 44°39'05" N, 6°56'13" E. Tête des Toillies (3,175 m) and Pic de la Farneireta (3,134 m) rise to the east, Roche Noire (3,134 m) and Péouvou (3,232 m) stand to the west, and further off the Bric de Rubren massif, also known as Mongioia (3,340 m), marks the Italian side of the border. How do you get there? The usual starting point is the village of Saint-Véran (2,042 m), known for having the highest parish church in Europe. From there, a trail follows the Aigue Blanche valley up to the Chapelle de Clausis, where a marked path begins its climb to the Col de la Noire (2,955 m). During summer, a regulated shuttle service runs through the valley, limiting car traffic in this fragile high-altitude environment. From the pass, it only takes a few more minutes to descend to the lake itself — and the col already offers a clear view down onto the water before you even reach it. What makes the geology here notable? The lake basin and its surroundings are built from ophiolites — rock formed on the floor of the ancient Tethys Ocean around 150 million years ago, at depths exceeding 3,000 meters. That deep-sea origin is what gives the area its unusual palette: green and black serpentinites sit alongside basalts with distinctive pillow structures, pale marbles, and occasional asbestos fibers. Finding slabs of former ocean floor thrust up to nearly 3,000 meters of elevation is uncommon in the Western Alps, which is one reason the route draws hikers with an interest in field geology. What wildlife and plants live around the lake? The bare, rocky ground around Lac de la Noire supports roughly 21 endemic or rare plant species adapted to extreme high-altitude conditions and the nutrient-poor ophiolitic soil. Among the animal species of particular conservation interest here are the rock ptarmigan and the bearded vulture, a bird closely associated with the highest ridgelines of the Southern Alps. Who is this hike suited for? Given the altitude — close to 2,900 m — and the rocky, demanding terrain, this route suits hikers with prior mountain experience who are prepared for changeable weather and steep sections near the pass. Summer is the best season, when the trail and the Aigue Blanche valley are fully accessible and the shuttle service simplifies reaching the trailhead. Frequently asked questions Is Lac de la Noire the same lake as Lac des Neuf Couleurs or Lac de Longet? No. These are separate lakes, even though all three lie within the commune of Saint-Paul-sur-Ubaye and the same high-altitude section of the Ubaye valley. Lac de la Noire is distinguished by its position right at the Col de la Noire, close to Tête des Toillies. How long does it take to reach the lake? The route runs from Saint-Véran through the Aigue Blanche valley and the Chapelle de Clausis up to the Col de la Noire, from which only a short, few-minute descent remains to the lake. Do you need a permit or reservation to access it? In summer, a regulated shuttle operates in the Aigue Blanche valley to protect the sensitive high-mountain ecosystem from excessive vehicle traffic. Can you swim in the lake? Given its altitude and the water temperatures typical of lakes above 2,800 m, it functions mainly as a scenic stop and viewpoint along the route rather than a swimming spot.

Lac de la Douche

Le Monêtier-les-Bains

Lac de la Douche is a small mountain lake sitting at 1,901 m in the Écrins National Park, within the commune of Le Monêtier-les-Bains in the Hautes-Alpes department. It occupies the Petit Tabuc valley above the hamlet of Le Casset, right below the Casset Glacier, and lies close to the Serre Chevalier ski area. Depending on the season and light, the water shifts between pale grey and a striking opaque blue. How do you get to Lac de la Douche? The hike begins at the car park in Le Casset, roughly 2 km from Le Monêtier-les-Bains and about 17 km from Briançon via the D1091 and D300 roads. From the village, the path follows the main street, crosses the second bridge over the Guisane river, and then runs alongside the Petit Tabuc stream. It first crosses hay meadows before entering a larch forest. After passing the barrier and small bridge at Clot du Gué, the trail climbs steadily through the larch woods to the Grand Pré clearing (1,683 m) and continues on to the lake. The round trip covers about 8.2 km and takes around 2.5 hours of walking. How difficult is the hike? It's rated as an easy, family-friendly outing, well suited to children. The climb is steady but gentle, mostly winding through forest rather than over steep or exposed ground. Hikers looking for a longer day can extend the route toward the Col d'Arsine. What is there to see along the way? The lower meadows are frequented by roe deer at dawn, while chamois are occasionally spotted higher up in the larch forest. The walk along the Petit Tabuc torrent and through the woods offers varied mountain scenery, moving from open meadow to rockier terrain near the lake itself. Once at Lac de la Douche, hikers are rewarded with a view of the Casset Glacier, one of the main draws of the excursion. Is the lake inside a national park? Yes. Lac de la Douche lies within the Écrins National Park, and part of the approach trail overlaps with the GR 54, the long-distance route that circles the Écrins massif. Standard national park conservation rules apply to the site. Can you swim or bring a dog? Swimming is discouraged to protect the lake's natural environment, and dogs are not permitted around the lake, even on a leash, since the area falls under Écrins National Park regulations. FAQ Where exactly is Lac de la Douche located? The lake sits at 1,901 m in the Petit Tabuc valley, in the commune of Le Monêtier-les-Bains (Hautes-Alpes), within the Écrins National Park, near the Serre Chevalier ski area. Where does the trail to the lake start? The trailhead is at the car park in Le Casset, about 2 km from Le Monêtier-les-Bains. How long does the hike take? The round trip is about 8.2 km and takes roughly 2.5 hours of walking. Is the trail suitable for children? Yes, it is rated easy and is a popular choice for families with children. Can you swim in the lake? No, swimming is discouraged, as the lake is protected within the Écrins National Park. Can the hike be extended? Yes, more experienced hikers can continue toward the Col d'Arsine. Is this the same lake as Lac de la Ponsonnière? No. Lac de la Ponsonnière is also in the commune of Le Monêtier-les-Bains but belongs to a different mountain range, the Cerces-Thabor massif, whereas Lac de la Douche lies in the Petit Tabuc valley of the Écrins massif, beneath the Casset Glacier.

Lac de la Petite Cayolle

Allos

Lac de la Petite Cayolle is a small glacial lake sitting at roughly 2,590 m altitude inside Mercantour National Park, in the commune of Allos (Alpes-de-Haute-Provence, Provence-Alpes-Côte d'Azur). The lake rests at the foot of the Garrets summit, just below the Col de la Petite Cayolle (2,639 m) — a separate pass from the better-known Col de la Cayolle road pass nearby, which serves as one of the common starting points for the hike. Where exactly is the lake? Lac de la Petite Cayolle lies at the head of the upper Verdon valley, surrounded by the bare, rocky terrain typical of the Mercantour massif. Its closest neighbour is Lac des Garrets, at 2,621 m, reached along the same panoramic ridge. From the trail near the pass, hikers also get a clear view down toward Lac d'Allos in the valley below. How do you get to the lake? The most common approach starts from the car park at Maison Forestière du Laus, at around 2,110 m. The full loop covers about 11 km, with roughly 750 m of elevation gain, and takes an average hiker close to 5 hours. The route passes the old forest house, turns toward the Col de la Petite Cayolle, crosses the Pas du Lausson (2,602 m), then drops to the Petite Cayolle and Garrets lakes before closing the loop back at the car park. A second option starts from the Col de la Cayolle itself. From there the trail climbs directly to the Col de la Petite Cayolle, follows a ridge with views over Lac d'Allos, passes Lac de la Petite Cayolle, and continues on to Lac des Garrets. This version lets hikers combine both passes in a single outing. When is the best time to go? The hiking season runs roughly from April to September. Snow patches can linger around the Col de la Petite Cayolle until mid-July in some years, which is worth factoring into early-season plans. The Maison Forestière du Laus car park is typically closed from October to May, depending on conditions. Dogs are not allowed on this trail, in line with the rules that apply inside the park's core protected zone. What else is worth knowing about the area? Like most high-altitude lakes in this part of the Mercantour, Lac de la Petite Cayolle formed through glacial activity. The stretch of ridge between the Col de la Cayolle and the Col de la Petite Cayolle, together with the lakes scattered along it, is one of the more recognisable hiking sectors in the western part of the park, combining views over the Verdon valley with the Garrets massif. FAQ How high up is Lac de la Petite Cayolle? The lake sits at about 2,590 m, just below the Col de la Petite Cayolle (2,639 m). Where's the best place to start the hike? Most hikers start from the Maison Forestière du Laus car park; starting from the Col de la Cayolle is a common alternative. How long does the hike take? The loop from Maison Forestière du Laus is about 11 km and takes around 5 hours for an average hiker. Is the trail difficult? It's rated as moderate, with about 750 m of elevation gain and some rocky sections near the pass. Can I bring my dog? No — dogs are not permitted in this part of Mercantour National Park. Are there other lakes nearby worth seeing? Yes, Lac des Garrets (2,621 m) sits right alongside it, and the trail also offers views down to Lac d'Allos in the valley below.

Lac des Estaris

Orcières

Lac des Estaris is a high-altitude lake in the commune of Orcières, in the Hautes-Alpes department, tucked into the Champsaur valley at the foot of the Écrins massif. Sitting at roughly 2,560 m, it is one of the commune's main water reserves and one of the best-known hiking destinations above the Orcières-Merlette ski resort. Where is Lac des Estaris located? The lake lies at the head of the Champsaur valley, above the Orcières-Merlette 1850 resort, ringed by peaks of the Écrins massif. The rocky amphitheater surrounding it is known as the Cirque du Grand Lac des Estaris, a nature reserve established in 1974 and managed by the Écrins National Park. The reserve covers around 145 hectares and protects high-altitude alpine flora, including génépi, a plant that grows only at elevation. How do you get to the lake? Lac des Estaris can be reached on foot directly from the resort, with about 450 m of additional elevation gain along the way. In summer, the Roche Rousse cable car shortens the approach considerably: after riding up to the Roche Rousse plateau, hikers only need to cover a shorter, easier stretch to reach the lake. Because the surrounding cirque is a protected nature reserve, dogs are not allowed anywhere within it. What is the hiking route like? The area's best-known route is the "Monde des 6 lacs" (World of Six Lakes) loop, covering about 11.3 km with 719 m of elevation gain and taking roughly 5 hours 20 minutes at a moderate difficulty level. Along the way, the trail passes several lakes at increasing altitudes: Lac des Sirènes (around 2,400 m), Lac Long (around 2,480 m), Lac Profond (around 2,470 m), and the Lacs Jumeaux (around 2,460 m), before finally reaching Lac des Estaris at about 2,560 m, the highest point of the loop. The final stretch opens up views over the peaks of the Écrins massif. It's worth noting that Lac des Sirènes is a separate lake, lower down and closer to the resort — Lac des Estaris is a distinct, higher point further along the same route, not the same body of water. When is the best time to hike here? The route is fully accessible in summer, once snow has cleared from the upper cirque, typically from June to September — the same period when the Roche Rousse cable car operates, making the approach easier. Outside the summer hiking season, the area also draws ski tourers, for whom Lac des Estaris is one of the classic backcountry skiing objectives around Orcières. FAQ Can you camp near Lac des Estaris? The lake sits within a nature reserve managed by the Écrins National Park, so the usual restrictions for protected areas apply, and dogs are banned throughout the cirque. How long does it take to reach the lake? The full "World of Six Lakes" loop takes about 5 hours 20 minutes, but the stretch from the resort to the lake itself — especially if you use the Roche Rousse cable car — can be covered much faster. Is Lac des Estaris the same as Lac des Sirènes? No — they are two different lakes on the same route. Lac des Sirènes lies lower down, closer to the resort, while Lac des Estaris is the higher, final lake in the cirque. How high up is the lake? Lac des Estaris sits at around 2,560 m, making it the highest of the lakes along the "World of Six Lakes" route.

Lac d'Estenc

Entraunes

Lac d'Estenc sits at roughly 1,780 metres on the Estenc plateau, in the commune of Entraunes in the Alpes-Maritimes. It marks the source area of the Var, the river that eventually reaches the Mediterranean near Nice, and it lies right at the edge of the core zone of the Mercantour National Park, just below the Col de la Cayolle. What kind of lake is it? Unlike the glacial tarns scattered across the higher parts of the Mercantour, Lac d'Estenc is man-made: a small hillside reservoir, or retenue collinaire, built in the 1960s on the plateau. It covers only about 0.6 hectares, so it reads more as a pond than a mountain lake, and it is fed by the water rising from the Var's source a short walk away. The Estenc plateau The plateau was historically used as summer pasture for the hamlet of Estenc, a settlement once cut off for months at a time by winter snow. Today it works as a gateway to the Mercantour National Park and as the starting point for several walking routes, including a loop across the open grassland with a short detour to the river source itself. The long-distance Grande Traversée du Mercantour (GTM) trail also passes nearby, linking Entraunes to Estenc. The gentle, pastoral character of the plateau contrasts with the steeper, rockier terrain found higher up in the park. What is there to do at the lake? A wooden walkway circles the water, with interpretive panels explaining the Var's source and the surrounding landscape. Picnic tables line the shore, and a wheelchair-accessible path runs from the car park at the Relais de la Cayolle hotel down to the lakeside deck — an unusual amenity at this altitude. The lake is also stocked with trout and open to anglers, with the season running from the second Saturday of March to the second Sunday of October; fly fishing, spinning and bait fishing are all permitted, and summer catches tend to be better near the inlets where fresh water enters the lake. Getting there Access is via the road that climbs from Entraunes toward the Col de la Cayolle, the same route followed by the Route des Grandes Alpes. The drive up the Var valley is scenic in its own right, and the car park sits directly beside the lake, making it an easy stop even for visitors not planning a long hike. FAQ Is Lac d'Estenc a natural lake? No. It is an artificial reservoir — a retenue collinaire — created in the 1960s on the Estenc plateau. Is this the same lake as Lac des Garrets? No. Lac des Garrets is a separate body of water also located within the Entraunes commune, but it is a distinct site with its own setting. Can you fish at Lac d'Estenc? Yes. Trout are present, and the fishing season runs from the second Saturday of March through the second Sunday of October. Is the lake accessible without a long hike? Yes. A car park sits right beside it, and a wheelchair-accessible path connects the Relais de la Cayolle hotel parking area to the lakeside deck. What else is nearby worth seeing? The source of the Var river is only a few minutes' walk away, and trails across the Estenc plateau lead toward the Col de la Cayolle and the boundary of the Mercantour National Park.

Lac du Génépy

Aussois

Lac du Génépy is a high-altitude glacial lake in the Savoie Alps, sitting in the commune of Aussois at the foot of the Labby Glacier, within the Vanoise massif. Its milky, turquoise-tinted water and the ring of granite peaks around it make it one of the most sought-after hiking destinations on this side of Vanoise National Park. Where is Lac du Génépy? The lake sits at roughly 2,900 m of elevation, tucked into a glacial cirque closed off by the peaks of Dent Parrachée and Rateau d'Aussois. It belongs to the commune of Aussois, in the Savoie department (Auvergne-Rhône-Alpes region), not far from Modane. The surrounding area falls within the core zone of Vanoise National Park, which means stricter nature-protection rules apply: camping is only allowed within a limited overnight window, and disturbing wildlife is prohibited. How do you reach the lake? The hike starts from the parking area at the dams (the "barrages") above Aussois, at around 2,000 m. From there the trail first heads toward the Refuge de la Dent Parrachée, at 2,511 m, then bends off behind the refuge, marked with the national park's yellow signposts, toward Lac du Génépy. About half an hour past the refuge, the path crosses a footbridge over a mountain stream before continuing up to the lake. The full ascent from the parking lot typically takes 3.5 to 4 hours one way, with close to 900 m of elevation gain. It's not technically difficult, but it is long and demands a reasonable level of fitness and sturdy footwear — better suited to experienced hikers than first-timers. Marmots are commonly spotted along the way, and ibex can often be seen higher up the slopes. Why is the water milky? The lake is fed by meltwater from the Labby Glacier, which hangs above it on the massif side. Glaciers grind rock into extremely fine particles — glacial flour — and it's this suspended sediment that gives Lac du Génépy its distinctive pale, opalescent colour, which shifts with the light and time of day. On the lake's right bank, a moraine marks how far the Labby Glacier extended during the Little Ice Age (roughly 1550–1850), when it reached considerably lower than it does today. When is the best time to visit? Given the altitude and how long snow lingers here, the trail is generally in full walking condition from June through September, though the lower sections can sometimes be reached from April onward. In peak summer, an early start is worthwhile — both because of the demanding high-mountain terrain and because wildlife tends to be more active in the cooler morning hours. FAQ How long does it take to reach Lac du Génépy? From the parking area at the dams above Aussois, plan on 3.5 to 4 hours of walking one way, depending on fitness and trail conditions. Is the hike difficult? The route is long, with about 900 m of elevation gain, but it doesn't require climbing equipment. Sturdy trekking boots and some route planning — ideally with an IGN map — are recommended. Can you swim in the lake? The water comes directly from glacial meltwater and stays very cold year-round, and the area lies within the national park's protected core zone, so swimming isn't practiced here. What wildlife might you see on the way? Marmots and chamois are commonly seen along the trail, and ibex are often visible in the higher sections, both typical of Vanoise National Park's high-altitude wildlife. Is this hike suitable for beginners? It isn't technically demanding, but the distance, altitude, and changeable alpine weather mean some prior high-mountain hiking experience is advisable, along with checking the forecast before setting out.

Lago della Vecchia

Venaus

Lago della Vecchia is a high-altitude glacial lake in the Cottian Alps, within the municipality of Venaus, in the Turin metropolitan area, Piedmont. Sitting at roughly 2,670 metres above sea level, it lies almost exactly on the Italian-French border — cross the ridge above it and you are already in the commune of Bramans, in the French department of Savoie. This unusual position means boundary markers can still be found right by the shore, even though the border itself was only fixed here by the 1947 Paris Peace Treaty, which settled a number of Alpine frontier disputes after the Second World War. Where exactly is the lake? Lago della Vecchia sits in a side range of the Susa Valley (Val di Susa), close to the Moncenisio pass and within sight of Bardonecchia, though it falls administratively within Venaus. Its coordinates place it at roughly 45°10' north latitude and 6°57' east longitude. Monte Giusalet, rising to 3,312 metres, dominates the skyline above the lake and serves as the clearest landmark in this part of the Cottian Alps. Where does the water come from? The lake is glacial in origin, occupying a rocky basin carved out by an ancient glacier. It drains via the Rio Berto stream, which in turn feeds the larger Cenischia torrent, itself a tributary of the Dora Riparia. On French IGN maps the lake appears under the name "Lac de la Vecchia," a small detail that underlines its position straddling the frontier. How do you get there? Several hiking trails reach the lake. One popular route starts near Bar Cenisio, at around 1,483 metres, climbing through cool larch woods and open alpine pastures to the highest point of the walk at roughly 2,674 metres — a total gain of close to 1,200 metres. A second option begins in Venaus, near the Mulatera area: the path climbs the eastern flank of Punta Mulatera to Rifugio Avanzà, then continues west along an easy, clearly marked trail (white-and-red waymarks) to the lake itself, which — according to hikers who know the area — appears suddenly in a rocky hollow just off the path. This variant involves around 800 metres of elevation gain. What else is there along the way? Rifugio Avanzà, passed on most routes, serves as a natural rest stop for walkers continuing toward the border ridge. The area is notably quiet and far less crowded than better-known destinations in the Susa Valley, which makes it appealing to hikers looking for a peaceful high-altitude walk away from the busier trails. Frequently asked questions Is this the same Lago della Vecchia as the one near Biella? No. Piedmont has two separate lakes sharing this name. The one described here sits in the Cottian Alps, in the municipality of Venaus, right on the French border. The other, in the pre-Alps near Biella, is an entirely different lake with its own characteristics and history — the two should not be confused. How high up is the lake? At around 2,670 metres above sea level, it is a typical high-altitude Alpine lake. Are there visible traces of the border at the lake? Yes — boundary markers from the line established by the 1947 Paris Peace Treaty can still be seen near the shore. Where's the best place to start the hike? The two most commonly used starting points are Venaus (near Mulatera) and Bar Cenisio; both routes pass through Rifugio Avanzà. Is the trail difficult? It requires reasonable fitness — elevation gain ranges from roughly 800 to nearly 1,200 metres depending on the route chosen, with the highest sections above 2,600 metres, so hikers should be prepared for genuine high-mountain conditions. What feeds the lake? Its waters are glacial in origin, and its only visible outflow is the Rio Berto stream, a tributary of the Cenischia.

Lac d'Isabe

Laruns

Lac d'Isabe is a small mountain lake in the Western Pyrenees, in the Pyrénées-Atlantiques department of France, within the municipality of Laruns. Sitting at 1,925 meters above sea level, it covers a modest 0.073 km² (roughly 7.3 hectares), tucked into a side valley off the wider Ossau valley, well away from the region's busiest trails. Where exactly is Lac d'Isabe? The lake sits in the Gorges du Bitet valley, a tributary of the Vallée d'Ossau, above the village of Eaux-Chaudes. This is a different corner of the Laruns municipality from the well-known Ayous lakes (Gentau, Bious-Artigues, Bersau) — Lac d'Isabe lies further north and is reached via a separate valley, which keeps visitor numbers noticeably lower. Steep, rocky slopes enclose the basin, and the lake faces north, meaning it gets less direct sun than many Pyrenean lakes sitting at a similar altitude. How do you get there? The classic approach starts in Eaux-Chaudes, following the Route des Gorges du Bitet a few kilometers off the main D934 road. Cars are left at a parking area by a bridge, at the point where the forest track becomes closed to traffic. From there, a trail marked with yellow blazes climbs steeply through forest before continuing along a demanding, ascending traverse all the way to the lake. The round trip covers about 10.8 kilometers and takes an average of six hours — this is a route for hikers with solid fitness and mountain experience, not a casual family walk. When is the best time to go? Given its altitude and north-facing position, the Bitet valley and the lake itself hold onto snow and ice well into the season — the water can stay frozen as late as early July. The hiking season generally runs from May through October or November, depending on that year's snow conditions. It's best to avoid the final stretch of the approach while it's still snow-covered, since the steep terrain and hard névé can turn dangerous even for experienced hikers. What should you know before setting out? Given the length and elevation gain of the route, plan for a full day out, carry enough water (there are few reliable sources on the upper section), bring a map or GPS track, and pack layers for changeable mountain weather. The reward for the climb is a lake enclosed by rock walls in the quiet of a side valley — a noticeably wilder atmosphere than the more frequented lakes of the Ossau valley. FAQ Is Lac d'Isabe the same as the Ayous lakes? No. The Ayous lakes (Gentau, Bious-Artigues, Bersau) sit in a different part of the Laruns municipality and are reached from an entirely separate trailhead. Lac d'Isabe lies in the Gorges du Bitet valley, further north, with its own approach. How long is the hike to the lake? The round trip is about 10.8 kilometers and takes an average of six hours to complete. Is it a difficult hike? Yes, it's a demanding route — a steep forest climb at the start followed by a sustained, ascending traverse, so good physical condition is needed. When is the lake free of ice? Typically from around July through October or November, though this depends on the season's snowfall — ice can linger into early July in some years. Where does the trail begin? The starting point is the parking area by a bridge on the Route des Gorges du Bitet, above Eaux-Chaudes, reached from the D934 road.

Lacs de Frémamorte

Valdeblore

Lacs de Frémamorte is a cluster of high-altitude lakes in the commune of Valdeblore, deep inside Mercantour National Park in the Alpes-Maritimes. Sitting above 2,300 metres, right below the ridge that marks the border with Italy, this group of lakes forms one of the more remote corners of the massif — quieter than the neighbouring Lac Nègre or Lac de Graveirette, though the three are often linked together on the same loop hike. What exactly are the Lacs de Frémamorte? Despite the singular-sounding name, Frémamorte is not one lake but an entire chain of them, spread across a rocky glacial cirque. On the French side, several lakes step down one below the other like natural retention basins; across the border, on Italian ground, another string of lakes fills a deep, stark mineral valley. The whole group sits right beside the Col de Frémamorte, a border pass at roughly 2,600 metres, and just above it rises the Cime de Frémamorte, a peak reaching about 2,730 metres. How do you get there? The usual starting point is the car park at Salèse, in the Haute-Vésubie valley, from where a steady, well-graded path climbs through larch and spruce forest. Depending on the route chosen — a shorter loop to the lakes or a longer traverse over the pass and border ridge — the hike covers roughly 13 to 16 kilometres round trip with 550 to 950 metres of elevation gain. Given the altitude, the area is really only accessible from summer into early autumn; outside that window snow covers the ground, and the pass itself becomes a destination for winter snowshoe outings. What will you see along the way? Beyond the lakes themselves, whose colour shifts from deep turquoise to near-navy depending on the light, the trail crosses slopes where rhododendrons bloom in summer, and near the old military barracks at the col it is common to spot chamois grazing the rocky ground. The view from Col de Frémamorte is one of the widest in this part of Mercantour: French valleys unfold on one side, the Italian peaks of the Argentera massif on the other. Where does the name come from? Frémamorte comes from "femme morte," meaning "dead woman," and refers to a local legend about the wife of the lord of Saint-Dalmas-de-Valdeblore. She is said to have fled toward her native Piedmont to escape mistreatment, but died at the pass — and the name stuck, eventually attaching itself to the whole chain of lakes and the peak above. Frequently Asked Questions How many lakes make up the Lacs de Frémamorte? It's a chain of several lakes stepped through a rocky cirque on both sides of the French-Italian border, some in France and some just across the line in Italy. How high up are the lakes? They start above 2,300 metres, with the nearby Col de Frémamorte reaching around 2,600 metres. Where's the best place to start the hike? The car park at Salèse, in the Haute-Vésubie valley, is the most common starting point for loops that take in both the lakes and the pass. Is Lacs de Frémamorte the same place as Lac Nègre? No — it's a separate group of lakes in the same Valdeblore and Mercantour National Park area. Lac Nègre and Lac de Graveirette lie nearby and are often combined on the same route, but they are distinct lakes in a different spot.

Lac Castérau

Laruns

Lac Castérau is a small mountain lake in the Ossau Valley, in the commune of Laruns (Pyrénées-Atlantiques, France), and one of the six lakes making up the well-known Ayous lakes group. Alongside Lac Gentau, Lac Bersau, Lac du Miey, Lac Paradis and Lac Roumassot, it forms part of a loop that draws hikers throughout the summer season. Castérau sits furthest into the massif, at the foot of the peak that shares its name, and marks one of the last stops on the classic tour of the Ayous lakes. Where exactly is Lac Castérau? The lake lies at roughly 1,943 m of elevation, within the French Pyrenees, close to the iconic Pic du Midi d'Ossau. Rising above its eastern edge is Pic Castérau (2,227 m), which lends its name to both the summit and the lake below. The area falls administratively within the commune of Laruns, and the usual starting point for reaching it is the car park at the Bious-Artigues dam, sitting at around 1,422 m. What does the lake itself look like? Castérau is an oligotrophic lake: clear water, a rocky, stony bed, and sparse aquatic vegetation, characteristic of the glacial tarns scattered across this part of the range. Its surface area is modest, a little over a hectare, making it one of the smaller lakes in the Ayous group. Despite its size, it holds a population of brown trout (truite fario), though anglers are required to release any catch back into the water and use a barbless hook, or one with the barb flattened. How do you get to Lac Castérau? Most visitors reach it on foot, as part of the loop hike around the Ayous lakes that starts from the Bious-Artigues dam car park. The trail passes Lake Roumassot, Lake Miey, Lake Gentau and Lake Bersau before reaching Castérau, which sits closer to the far end of the circuit. Walking from the car park up to the lakes area typically takes around three hours, depending on pace and the exact route chosen. During the summer, access to the Bious-Artigues car park is sometimes restricted, with a shuttle service running from Laruns to ease congestion on the narrow approach road. What views does the area offer? The main draw here is the view of the north face of Pic du Midi d'Ossau, the sharp, unmistakable peak visible from most of the lakes in the group. From Castérau, other ridgelines enclosing the valley also come into view, including the more distant Pic des Moines. The surroundings feel rockier and starker than around the lower-lying Gentau or Bersau, giving Castérau the character of the most remote stop along the route. Is it worth stopping here? Lac Castérau is often bypassed by hikers rushing toward the postcard view at Lac Gentau, which tends to leave it quieter and less crowded. For those walking the full Ayous loop, it makes a natural last stop before heading back toward the car park — a good spot to rest away from the busiest stretch of the trail. FAQ Can you swim in Lac Castérau? The water stays cold year-round, typical of glacial lakes sitting near 2,000 m, and the bed is rocky — this is a spot for walking and taking in the view rather than swimming. How long does it take to reach the lake? From the Bious-Artigues car park, reaching the Ayous lakes area, including Castérau, usually takes around three hours, depending on fitness and the chosen route. Is fishing allowed? Yes, the lake holds brown trout, but any catch must be released back into the water, and only barbless hooks (or ones with the barb crushed) are permitted. Is it close to the other Ayous lakes? Yes, Castérau is one of six lakes in the group, along with Gentau, Bersau, Miey, Paradis and Roumassot, all linked by the same loop trail. How do you get to the trailhead? The starting point is the car park at the Bious-Artigues dam in the commune of Laruns; access can be regulated in summer, with a local shuttle bus from Laruns offered as an alternative.

Lac de Graveirette

Valdeblore

Lac de Graveirette is a small glacial lake sitting at roughly 2,240 meters above sea level in the Mercantour massif, within the commune of Valdeblore in the Alpes-Maritimes department of France. It lies inside Mercantour National Park, close to the Franco-Italian border and near the Col de Salèse. The area is home to several high-altitude lakes, including the nearby Lac Nègre and Lac Scluos, but Graveirette has a look and feel very much its own. What does the lake look like? Graveirette is tiny by regional standards, covering roughly one hectare of surface area. Unlike the bare, rocky shoreline of neighboring Lac Nègre, its banks are lined with larch trees and grassy meadows, giving the spot a softer, more welcoming atmosphere. The water itself is notably clear, with a green to emerald tint that hikers often single out as one of the prettiest in the area. How do you get to Lac de Graveirette? Several hiking routes lead to the lake. A common approach starts from the parking area near Col de Salèse, from which the lake is about 6 kilometers away, typically a 1.5 to 2 hour walk one way. A longer loop option begins at Le Boréon, near Saint-Martin-Vésubie, climbing over the Col de Salèse itself; depending on the exact route chosen, this version runs somewhere between 12 and 14 kilometers with several hundred meters of elevation gain, and takes roughly 5 to 6 hours round trip. Many hikers combine the visit with the neighboring lakes — Lac Nègre or the small tarns of the Frémamorte valley — turning it into a full day out among the high lakes of the Mercantour. Who is this hike suitable for? The walk to Graveirette is demanding in terms of distance and elevation gain but technically straightforward, with no climbing gear required. Given the altitude, the best window for a visit is summer into early autumn, once the trail has cleared of snow. Weather in this part of the Alpes-Maritimes can shift quickly, so an early start and rain gear are worth packing regardless of the season. What's along the way? The surroundings are classic high Mercantour scenery: open meadows, rocky ridgelines, and stands of larch. Mercantour National Park is known for its wildlife, and the Graveirette–Col de Salèse area is a reasonable spot to see marmots and chamois, sometimes alongside ibex higher up the slopes. Compared with the busier Lac Nègre, Graveirette tends to stay quieter, appealing to hikers looking for a calmer high-mountain stop. Can you fish in the lake? Yes. The lake is stocked with trout and is popular with fly fishers. It falls under the management of the local Moyenne Tinée fishing association (AAPPMA), so anyone planning to fish should check current rules and pick up the required fishing permit beforehand. Frequently asked questions How long does it take to reach Lac de Graveirette? It depends on the route: about 1.5 to 2 hours one way from the Col de Salèse parking area, or roughly 5 to 6 hours round trip on the longer loop starting at Le Boréon. Can you swim in the lake? At around 2,240 meters, the water stays cold year-round, so it isn't a typical swimming spot — visitors mainly come for the scenery, fishing, and hiking. How does Graveirette compare to Lac Nègre? Lac Nègre has a starker, rockier shoreline, while Graveirette is ringed by larches and green meadows, giving it a noticeably softer landscape. Is the trail suitable for beginners? The shorter approach from Col de Salèse suits reasonably fit hikers with some experience; the longer loop via Le Boréon calls for better stamina given its distance and elevation gain.

Lac Nègre

Valdeblore

Lac Nègre sits at 2,354 metres above sea level in the commune of Valdeblore, within the Vésubie valley in France's Mercantour National Park, in the Alpes-Maritimes department. It is generally regarded as the largest body of water in this stretch of the Maritime Alps, making it one of the signature hiking destinations in the area. How big is the lake, and where does its name come from? The lake stretches roughly 530 metres by 260 metres, covering just under 14 hectares. It is a glacial lake, occupying a rock basin carved out by an ancient glacier. Its name — from the French word for "black" — points to the dark tone of the water, produced by reflections off the surrounding granite landscape combined with the lake's considerable depth, which runs to several dozen metres. How do you get to Lac Nègre? Most hikers start from Saint-Martin-Vésubie, driving the D89 toward Boréon and continuing past the reservoir to the Salèse car park, one of the entry points into Mercantour National Park. From there, the route follows the GR 52 long-distance trail, which links Saint-Dalmas-de-Valdeblore with Menton over its full course. The path climbs the right bank of the Salèse valley toward the Col de Salèse before branching off to the lake itself. The round trip typically takes between 5.5 and 6 hours and involves about 650 metres of elevation gain — a moderately demanding outing best suited to hikers with some mountain experience. Does the lake have a notable history? Lac Nègre has an unusual chapter in its past. In 1958, army engineers from the 7th Engineering Regiment used the lakebed for a seismic experiment, detonating a large quantity of explosives to measure how shock waves travel through the earth's crust. According to local mountain guides, the blast sent a plume of water several metres into the air. What rules apply inside the national park? Because the lake lies within the core zone of Mercantour National Park, strict conservation rules apply. Picking plants, bringing dogs, and setting up camp are all prohibited. Visitors are expected to stay on marked paths and respect the quiet of this high-altitude environment, home to wildlife that depends on minimal disturbance. FAQ How high up is Lac Nègre? The lake sits at an altitude of 2,354 metres. Is it really the largest lake in the area? Yes — it is widely considered the largest body of water in this part of Mercantour National Park, with a surface area of nearly 14 hectares. How long does the hike take? From the Salèse car park, following the GR 52 trail, the round trip usually takes 5.5 to 6 hours, with around 650 metres of elevation gain. Can you camp near the lake? No. The area falls within the national park's core zone, where camping is banned and other conservation restrictions apply. Why is the lake called "Nègre"? The name refers to the dark colour of its water, caused by reflections from the surrounding granite terrain and the lake's substantial depth.

Lac du Crachet

Crévoux

Lac du Crachet is a glacial mountain lake sitting at roughly 2,238 metres above sea level in the commune of Crévoux, in the Hautes-Alpes department of France. The lake fills a rocky basin inside a wild cirque, closed off on one side by the Col du Crachet and rising on the other toward the Col de Lalatcha at 2,820 metres. It ranks among the favourite hiking destinations in the Crévoux valley near Embrun, prized for its remoteness and raw high-mountain scenery. How do you get to the lake? The starting point is the hamlet of La Chalp, where a car park sits about a kilometre further along the road on the left, deeper into the valley. From there the path climbs gently through meadows and past bubbling streams before switching into a series of tighter turns through cool, shaded forest. Roughly halfway up, walkers pass a waterfall, then continue alongside the Crachet stream until the terrain levels out at the rocky shelf holding the lake. How long is the hike and who is it suited for? The round trip covers about 6.5 kilometres with close to 577 metres of elevation gain, typically taking around three and a half hours. It's considered a moderately demanding walk — solid fitness helps, but no technical mountaineering skills are required. Less experienced hikers should still budget extra time and bring proper trekking footwear. When is the best time to visit? Because the lake's water level depends on how fast the surrounding snow melts, it isn't fed continuously all year round. The most rewarding window falls before mid-July, when meltwater still tops up the basin and the surrounding meadows are at peak bloom. Later in the season, the water level can drop noticeably. What can you see along the way and at the lake itself? The route opens up views over the Crévoux valley and the Parpaillon cirque, with the Razis waterfall also visible from the trail. High-altitude meadows here support plants such as yellow gentian, a flower typical of alpine pastures. Chamois and marmots are commonly seen among the rocks ringing the lake, and birds of prey occasionally circle overhead along the ridgelines. The stillness and starkness of the setting make it a particular draw for nature photographers and hikers looking to get away from crowded trails. Is it a good spot to rest or picnic? The shores of Lac du Crachet, hemmed in by the cirque's rocky walls, offer a natural place to catch your breath after the climb. Keep in mind this is a high-mountain zone without tourist infrastructure — no benches, refreshment stands, or marked camping spots — so any rubbish needs to be carried back down to the valley. FAQ Where exactly is Lac du Crachet located? The lake lies in the commune of Crévoux, in the Hautes-Alpes department, in the Provence-Alpes-Côte d'Azur region, at an altitude of about 2,238 metres. How long does the hike to the lake take? The round trip from La Chalp usually takes around three and a half hours, covering roughly 6.5 kilometres with about 577 metres of elevation gain. Is the trail difficult? It's rated moderately demanding, manageable for hikers with average fitness, though sturdy footwear and a full day's time budget are recommended. When does the lake look its best? The window before mid-July is ideal, when snowmelt keeps the basin full and the surrounding meadows are in full bloom. Is wildlife commonly seen near the lake? Yes — chamois and marmots inhabit the area around the lake, and birds of prey can often be spotted circling the surrounding ridges.

Étang du Petit-Haut

Lepuix

Étang du Petit-Haut is a small pond tucked into the southern slope of the Ballon d'Alsace, inside the state forest that covers this part of the Vosges, within the commune of Lepuix (Territoire de Belfort). It sits away from the crowds that gather at the summit itself, offering a quieter stop where the trail meets still water framed by forested slopes. Where exactly is the pond? The pond lies at roughly 920 metres above sea level, within the forested land belonging to Lepuix. It is fed and crossed by the Savoureuse river, which rises in this part of the massif before flowing down toward the industrial valley near Belfort. A second, smaller pond, Étang des Roseaux, sits close by, and the two are commonly visited together as part of one loop walk. How do you get there on foot? The most straightforward approach starts from the car park near Bon Pommier, reached via the D485 road linking Lepuix to the Ballon d'Alsace state forest. An alternative route begins on the D465 between Giromagny and Ballon d'Alsace. The pond also lies directly on the GR5, the long-distance trail that runs through the Vosges toward the Jura and the Alps, making it a natural resting point for hikers covering longer stretches of that route. A popular loop linking both ponds with the surrounding forest runs just under 9 km, with a moderate amount of climbing suited to walkers with average fitness. What is there to do around the water? The banks of Étang du Petit-Haut are gentle and partly sandy, making it a comfortable stop for families with children, without demanding a scramble through dense woods or steep ground. It works well as a picnic spot on a longer outing through the area. Hikers looking to extend the walk can combine it with other nearby features of the Ballon d'Alsace, including the Rummel waterfall and the spot known as Saut de la Truite, with the Vierge du Ballon statue marking the summit further up. How did this pond come to exist? The pond is not entirely natural — it was built in the 19th century as an artificial reservoir designed to keep the Savoureuse at a workable level during dry spells. Its stored water once powered hydraulic machinery used by industrial works further down the valley. That original purpose has long since faded, and today the reservoir blends into its surroundings as one of several ponds scattered across this stretch of the Vosges, valued mainly for its setting rather than any industrial role. Frequently asked questions Can you swim in the pond? Étang du Petit-Haut functions mainly as a scenic waypoint on a hiking route rather than a swimming spot — it's best treated as part of a longer walk rather than a standalone beach destination. How long does it take to reach it? This depends on the starting point. From the Bon Pommier car park or the D465, reaching the pond typically takes anywhere from a short stroll to closer to an hour one way, depending on the chosen route. Is the walk suitable for children? The immediate area around the pond, with its gentle, partly sandy shore, is manageable even for young children. Longer loops connecting both ponds with the slopes of Ballon d'Alsace call for a basic level of fitness. Is the pond close to the Ballon d'Alsace summit? Yes, it sits on the mountain's southern slope within the same forest block, making it a convenient waypoint for anyone planning to continue up to the summit.

Nature in France

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Lac glaciaire de Bionnassay

Lac des Cordes

Lac de Viry

Lac de Souliers

Lac Vert

Lac des Brenets

Lac de Belledonne

Lac de Bracca

Lac de Fontaine

Lac de la Noire

Lac de la Douche

Lac de la Petite Cayolle

Lac des Estaris

Lac d'Estenc

Lac du Génépy

Lago della Vecchia

Lac d'Isabe

Lacs de Frémamorte

Lac Castérau

Lac de Graveirette

Lac Nègre

Lac du Crachet

Étang du Petit-Haut

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