Lac d'Arredoun is a lake in Hautes-Pyrénées, France. At an elevation of , its surface area is , and its depth is 21 m.
It is mostly accessible via the French hiking footpath GR 10 going through the Pyrenees mountain range, whose route goes through southwestern France.
The lake is classified as a ZNIEFF and is also part of the Adour basin, which stems from the river Adour.
References