The Lac de Monteynard-Avignonet (Lake of Monteynard-Avignonet) is an artificial water reservoir for the Électricité de France power station on the river Drac. It belongs to the department of Isère. It is bounded by the canyons of the Drac and Ebron.
The lake was created in 1961, when the 145-metre-high dam was built. The lake is 10 kilometres long; in some places it is up to 300 metres wide.
This lake is often windy and wavy. It is considered to be one of the best places for windsurfing and kitesurfing in Europe. It is also an important site for fishing, as it has a great variety of fish species. Swimming in the lake is not permitted, it is tolerated at Treffort plage as long as you stay near the shore.
