The Lake Perrin (pronounced Fr. <small>IPA</small>: â Lac Perrin in French) at an elevation of 2,633.2 m a.s.l. is a natural lake of glacial origin located in the Ayas Valley.
The lake occupies a basin defined to the west by a steep grassy ridge at 2,771 m, to the northeast by the , and to the southeast by the ., whose rocky northwestern slope looms over the water surface. The Mascognaz stream originates from the lake, a tributary of the ÃÂvançon. It is fed by surrounding snowfields. The waters host significant fish fauna, and the shores are bordered by cotton grass
The lake can be reached via a marked trail starting from Champoluc, passing through either the Mascognaz valley or the Cunéaz stream valley, allowing for an interesting loop hike for those who take one trail up and the other down. Due to the pristine nature of the area, the lake is considered of notable scenic value. From the lake, one can continue toward the Grande Cime or the Mont Perrin.