Hard hike. Very good fitness required. Mostly accessible paths. Sure-footedness required. The starting point of the route is right next to a parking lot.

Last updated: June 5, 2024

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Waypoints

Start point

Parking

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2.46 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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3.44 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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4.95 km

Lac Castérau

Highlight • Lake

Lake Castérau is located on the edge of the road to Saint-Jacques-de-Compostelle. It is one of the six lakes of Ayous. Located at the foot of the Castérau peak (2,227 …

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6.47 km

Bridge over le Gave de Bious

Highlight • Other

Bridge for hikers across the stream.

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8.81 km

Ossau Valley

Highlight • Gorge

This valley follows the course of the Gave de Bious and offers a superb deep and clear panorama. A green expanse in contrast with the passes, peaks and rocky massifs …

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10.9 km

Lac Roumassot

Highlight • Lake

Lake Roumassot is the lowest of the Ayous lakes. This natural lake of glacial origin is located at an altitude of 1,845 meters and serves as a summer pasture for …

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11.5 km

Lake Miey

Highlight • Lake

Lac de Miey is located at an altitude of 1,914 meters in the Ossau valley. It is located between Lake Gentau higher up and Lake Roumassot below.

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11.8 km

Lac Gentau and View of Pic du Midi d'Ossau

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 …

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12.4 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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13.4 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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18.9 km

End point

Parking

Way Types & Surfaces

Way Types

10.1 km

6.47 km

1.38 km

421 m

287 m

226 m

Surfaces

9.77 km

7.77 km

731 m

357 m

287 m

Elevation

Highest point (2,160 m)

Lowest point (1,540 m)

Weather

Friday 19 December

3°C

-1°C

17 %

Additional weather tips

Max wind speed: 15.0 km/h

to get more detailed weather forecasts along your route

This route was planned by komoot.

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Lacs d'Ayous – circular from Astún

Ibón del Escalar

Lac du Plaa de las Basques

Lac Castérau

Bridge over le Gave de Bious

Ossau Valley

Lac Roumassot

Lake Miey

Lac Gentau and View of Pic du Midi d'Ossau

Refuge d'Ayous

Lac Bersau

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