Lac de Serre-Ponçon

Lake Serre-Ponçon is a reservoir in the departments of Hautes-Alpes and Alpes-de-Haute-Provence, Provence-Alpes-Côte d'Azur region, in southeast France, one of the largest in Western Europe. The lake gathers the waters of the Durance and the Ubaye rivers, flowing down through the Hautes-Alpes and the Alpes du Sud to the Rhône. The waters are dammed by the Barrage de Serre-Ponçon, a 123-metre high earth core dam.

As well as water control, sixteen hydroelectric plants use the water, and the lake provides irrigation to 1,500 square kilometres of land.