estany Tort de Colieto

Estany Tort de Colieto is a small glacial lake in the municipality of la Vall de Boí, tucked away at roughly 2,400 meters above sea level in the Colieto valley, inside Aigüestortes i Estany de Sant Maurici National Park. The name "tort" (twisted, crooked) describes the lake's elongated, irregular basin, carved by glacial action into the hard granite bedrock of the Catalan Pyrenees.

Where exactly is the lake?

Estany Tort de Colieto sits in the Vall de Colieto, a side branch of the Capçalera de Caldes — the upper catchment of the Caldes stream that feeds the whole lake system in this part of the park. The valley shows classic glacial features: steep rock walls, moraine debris, and a stepped sequence of small lakes, of which Estany Tort de Colieto is one of the smaller ones, covering only about 0.6 hectares.

How do you get there?

The starting point is the car park at the Cavallers dam (around 1,697 m), reached by road from la Vall de Boí. From there, a hiking trail climbs into the Caldes valley, passing the Refugi Ventosa i Cavell mountain hut, which serves as a waypoint and rest stop along the way. The path then branches into the Colieto side valley and climbs to the high alpine basin where the lake lies. Given the altitude gain and rugged high-mountain terrain, the hike calls for reasonable fitness and proper trekking footwear — plan for most of a day.

What will you see there?

Estany Tort de Colieto is a typical Aigüestortes cirque lake — a small, still body of water framed by bare rock and high-altitude meadows, with no tourist infrastructure around it. The same Colieto valley holds several other lakes, including Estany Blau de Colieto, so it's easy to combine more than one lake into a single outing. The surrounding landscape is quintessential Pyrenean high country: sharp granite ridges, glacial cirques, and the many "estanys" — mountain lakes — that give Aigüestortes its Catalan name.

When is the best time to visit?

Because of the altitude (2,400 m), the valley can stay snow-covered well into late spring, so summer — roughly June/July through September — is the best window, once trails have cleared of snow. Early in the season, meltwater still keeps streams and lakes running high, reinforcing the glacial character of the landscape.

Frequently Asked Questions

Can you swim in the lake? High-altitude lakes in Aigüestortes stay very cold year-round, and the terrain around Estany Tort de Colieto is protected, rugged natural landscape — swimming isn't a typical activity here.

Is the hike suitable for children? Given the altitude, the length of the approach, and the high-mountain terrain, the route into the Colieto valley is demanding and better suited to hikers with good fitness than to an easy family stroll.

Is there a mountain hut nearby? Yes, the Refugi Ventosa i Cavell lies along the approach route and serves as a rest point and landmark for hikers heading toward the Colieto valley.

Are there other lakes worth seeing in the same valley? Yes, the Vall de Colieto also holds other lakes, including Estany Blau de Colieto, making it possible to visit several glacial lakes in a single day.