The Arrémoulit refuge and its lake at 2305 m are nestled in the heart of a glacial cirque formed by the walls of the highest peaks in the Ossau Valley (Palas 2974 m, Arriel 2824 m). It can be accessed without technical difficulty, allowing hikers to get close to the mineral world of the high mountains and high altitude lakes.

Keep an eye out for isards and marmots in the area! The marmot, which disappeared from the Pyrenees at the end of the last ice age, was reintroduced in 1948. Many were released in 1967, when the National Park was created. Today it occupies all the Pyrenean valleys and its strident cry, which one might think came from a bird, will accompany you on your summer walks.