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Refuge d'Ayous – Lac Bersau loop from Puerto Astún

Routes

Running trails & routes

Refuge d'Ayous – Lac Bersau loop from Puerto Astún

Hard

runners

Refuge d'Ayous – Lac Bersau loop from Puerto Astún

02:37

14.4km

870m

Running

Hard run. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required. The starting point of the route is accessible with public transport.

Last updated: April 17, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parc national des Pyrénées (cœur)

Waypoints

Start point

Bus stop

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2.07 km

Ibón del Escalar

Highlight • Lake

Charming lake near that of Truchas where you can rest contemplating it or continue climbing towards other higher ones, already in France.

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3.16 km

Lac du Plaa de las Basques

Highlight • Lake

Located at 2,059 meters above sea level, this small lake offers an absolutely incredible panorama of the Pic du Midi d'Ossau and the surrounding peaks.

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4.22 km

Lake Castérau

Highlight • Lake

Beautiful place with the Midi d'Ossau (2884m) in the background.

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5.17 km

Lake Bersau is located 2,080 meters above sea level, at the foot of Pic Casterau. It is one of the six lakes of Ayous which mark out the paths of the Pyrenean Haute Route and the GR10, in this sector.

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6.53 km

Refuge d'Ayous

Highlight • Mountain Hut

The Ayous refuge is open from the end of May to the beginning of October. For the precise dates, which change from one year to the next, you can go …

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7.02 km

Lac Gentau

Highlight • Lake

The Ayous lakes form a group of six lakes: Castérau, Miey, Gentau, Bersau, Paradis and Roumassot.

Arranged in stairs, they form a magnificent amphitheater to land and admire the Pic du Midi d'Ossau.

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9.15 km

Lac Bersau

Highlight (Segment) • Lake

Lake Bersau is located 2,080 meters above sea level, at the foot of Pic Casterau. It is one of the six lakes of Ayous which mark out the paths of …

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11.5 km

Col des Moines

Mountain Pass

14.4 km

End point

Bus stop

Way Types & Surfaces

Way Types

8.11 km

5.85 km

230 m

198 m

Surfaces

7.35 km

5.83 km

745 m

461 m

< 100 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Weather

Wednesday 27 May

23°C

10°C

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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Refuge d'Ayous – Lac Bersau loop from Puerto Astún

Ibón del Escalar

Lac du Plaa de las Basques

Lake Castérau

Lake Bersau

Refuge d'Ayous

Lac Gentau

Lac Bersau

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