Lac de Suyen

Lac de Suyen is a small mountain lake in the commune of Arrens-Marsous, in the Hautes-Pyrénées department of France, sitting at an altitude of 1,536 metres in the Val d'Azun valley. Covering only about 0.02 square kilometres, it ranks among the smaller lakes of this part of the Pyrenees, its level raised slightly by a small dam. The lake is fed by the Gave d'Arrens, a mountain stream flowing down from the upper valley. Lying inside the Pyrenees National Park, Suyen is the first high-altitude lake reached by hikers approaching from the Val d'Azun side, which makes it a popular target for a half-day outing.

How do you get to Lac de Suyen?

The usual starting point is the Plan d'Aste car park, at the end of the D105 road that climbs toward Lac du Tech, at roughly 1,470 metres. It sits about 10 kilometres south of the village centre of Arrens-Marsous, and the drive from Argelès-Gazost takes around half an hour. The Maison du Parc des Pyrénées, an information point for the national park, is located close to the car park. The D105 access road is closed during winter and part of spring, so it is worth checking conditions before setting out.

What does the trail to the lake look like?

From the Plan d'Aste car park, the path leads past the building there and crosses the Gave d'Arrens on a wooden footbridge. From there it winds through an attractive fir forest before opening onto the lakeshore. The route is easy, clearly marked, and gains little elevation, making it suitable for families with children. A round trip typically takes between two and two and a half hours, depending on pace and the number of stops along the way.

What else can you see along the way?

Along the route, the Doumblas waterfall makes for a worthwhile stop, and a small pool near the path is often a hit with children. More experienced walkers can extend the hike further into the valley toward other lakes, such as Lac de Batcrabère or Lac de Rémoulis, though reaching them requires considerably more time and stamina.

Is the lake within a protected area?

Yes, part of the route runs through the core zone of the Pyrenees National Park, where dogs are not allowed. This is a strictly protected natural area, so hikers should stay on the marked path and respect the park's rules.

FAQ

At what altitude is Lac de Suyen? The lake sits at 1,536 metres in the Val d'Azun valley.

How big is the lake? It is a very small body of water, covering about 0.02 square kilometres.

How long does the hike take? From the Plan d'Aste car park, at 1,470 metres, the round trip usually takes two to two and a half hours.

Is the trail suitable for children? Yes, it is an easy, well-marked path with little elevation gain, generally considered family-friendly.

Are dogs allowed? Not throughout — part of the trail lies within the national park's core zone, where dogs are prohibited.

Is the access road open all year? No, the D105 road to Plan d'Aste is closed in winter and part of spring.