Estanh Long de Colomèrs

Estanh Long de Colomèrs is the largest glacial lake in the Colomèrs cirque, one of the best-known natural landmarks of Vall d'Aran in the Catalan Pyrenees, within the municipality of Naut Aran.

Where is Estanh Long de Colomèrs?

The lake sits at the heart of the Colomèrs cirque, a broad glacial basin ringed by peaks approaching 3,000 metres, including Tuc de Ratera, Gran Tuc de Colomèrs and Creu de Colomèrs. The cirque is one of the largest formations of its kind in the entire Pyrenean range and holds several dozen small lakes, locally called "estanhs," of which Estanh Long is the biggest. The whole basin was carved out over thousands of years by glacial erosion, leaving behind a chain of rocky hollows now filled with clear mountain water.

How do you get there?

Most visitors start from the Montanheta area, where a marked path climbs into the valley toward the cirque. In summer, part of the approach can sometimes be covered by private off-road vehicle or a local mountain taxi service, though availability depends on the season and road conditions, so it's worth checking locally before setting off. From there, the route continues on foot, steep at first and gentler further on, passing the first lakes before reaching the area around the Refugi de Colomèrs mountain hut, a natural landmark and rest stop for hikers.

What will you see along the way?

Estanh Long lies on the popular "seven lakes route," which links Estanh dera Lòssa, Estanh Major, Estanh de Colomèrs, Estanh Mòrt, Estanh des Garguilhs de Jos, Estanh de Cabidornats and Estanh Long itself. It's a moderately demanding loop through bare, high-mountain terrain, with steep ridgelines overhead and a string of lakes shifting through shades of turquoise and blue. The paths within the cirque are waymarked and loop-shaped, so the walk can be shortened or extended depending on fitness: some visitors turn back after the first couple of lakes, while others push on to the higher reaches of the cirque, including the glacial lake of Estanh Gelat further up.

When is the best time to visit?

Summer, roughly from June to September, is the best window, when trails are free of snow and lake levels are stable. Outside that period, snow can linger in the higher parts of the cirque, making some lakes harder to reach. Setting out early in the morning is a good idea — weather in the Pyrenees can shift quickly during the day, and the morning light brings out the colour of the water and the surrounding peaks particularly well.

Frequently Asked Questions

Is Estanh Long de Colomèrs the highlight of the cirque? It's the largest lake in the whole complex, so it's one of the main draws — but the route strings together several lakes, so it's worth planning the full loop rather than aiming for just one stop.

Is the hike difficult? Trails through the Colomèrs cirque vary in difficulty, from easier stretches near the lower lakes to steeper climbs higher up. The route is waymarked and can be shortened or lengthened depending on your fitness level.

Can you drive close to the lakes? Direct vehicle access into the valley is often limited, and in season local off-road taxis can bring hikers closer to the trailhead. It's best to confirm current access arrangements locally, since they depend on the time of year.

Is there anywhere to stay nearby? Yes, the Refugi de Colomèrs mountain hut sits within the cirque and serves as both a landmark and a base for hikers who want to split the visit over more than one day.