The Lac de Monteynard-Avignonet (Lake of Monteynard-Avignonet) is an artificial water reservoir for the Électricité de France (EDF) power station on the river Drac.

Swimming in the lake is not permitted, it is tolerated at Treffort plage as long as you stay near the shore.

The lake is bordered by the following municipalities: Avignonet, Cognet, Marcieu, Mayres-Savel, Monteynard, La Motte-Saint-Martin, Roissard, Saint-Arey, Sinard, Treffort.

Locally, the Drac and Ebron bridges are known as passerelles himalayennes (French, "Himalayan footbridges").

The bridges allow hiking and biking from Matheysine to Trièves, as part of a 30 km route around the lake.