Lac d'Ambléon

Lac d'Ambléon is a small mountain lake in the commune of Ambléon, in the Ain department, within the Auvergne-Rhône-Alpes region of France. Tucked into the Bas-Bugey massif at the foot of the Tentanet mountain, it sits at roughly 712 metres above sea level and is ringed by conifer forest. Locals and visitors alike rank it among the prettiest lakes in the Bugey area, and it draws a steady mix of walkers, photographers and anglers.

What makes this lake distinctive?

At barely 5.6 hectares, Lac d'Ambléon is modest in size, and only part of it is genuinely deep — the rest is a marshy fringe of reeds and wetland vegetation that shelters herons, dragonflies and amphibians. One notable trait is that the lake has no visible surface outlet: excess water simply seeps away through the limestone bedrock beneath it, a drainage pattern typical of the karst terrain that underlies much of the Bugey. Because of this ecological richness, the site is listed among the Ain department's Espaces Naturels Sensibles (ENS), one of 32 such protected areas in the department, and it also carries a ZNIEFF type I designation, marking it as a habitat of recognised value for local plant and animal life.

Can you swim or fish here?

Swimming is not permitted, a rule meant to protect the shoreline habitat and water quality. Fishing, on the other hand, is actively practised — though the lake is privately managed, so a fishing permit is required before casting a line. Permits are sold at the Ambléon town hall and at a sports shop in nearby Artemare. The waters hold trout, perch, pike, whitefish and carp. A set of clear rules governs the activity: no night fishing, no boats of any kind (including for carp baiting), no combustion or electric motors, and no open fires or barbecues along the banks. Anyone under 18 must fish alongside an adult who holds a valid permit.

What hiking routes pass by the lake?

A roughly 6-kilometre loop trail circles Lac d'Ambléon through the surrounding woods, opening onto viewpoints over both the valley and the water below. It's an easy, well-marked walk suited to families and casual hikers. Those looking for more of a challenge often combine the lakeside loop with the ridge walk to Innimond, which rewards the climb with sweeping views across the Bas-Bugey countryside. Thanks to modest visitor numbers and its largely untouched setting, the area feels quieter than many of the better-known trails in the Ain department.

When and how should you visit?

The lake lies close to the village of Ambléon, a short distance from Artemare and the main roads linking the Bugey hills to the Rhône valley. Given the forest surroundings and the elevation above 700 metres, late spring through early autumn offers the most comfortable conditions for walking and fishing, while the turning leaves in autumn add another reason to visit for anyone drawn to quiet, forested landscapes.

FAQ

Is swimming allowed at Lac d'Ambléon? No — swimming is prohibited to protect the lake's plant and animal life.

Can you fish at the lake? Yes, but only with a permit, since the lake is privately managed. Permits are available from Ambléon town hall and a sports shop in Artemare.

How long is the walking loop around the lake? About 6 kilometres, on an easy, family-friendly trail.

Does the lake have protected status? Yes — it is listed as an Espace Naturel Sensible of the Ain department and carries a ZNIEFF type I designation.

How big is the lake? It covers about 5.6 hectares, and its deeper zone stays within a range of roughly ten metres.