Lake Serre-Ponçon is a lake in southeast France; it is one of the largest artificial lakes 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 River. The waters are dammed by the Barrage de Serre-Ponçon, a 123 m high earth core dam. As well as water control, sixteen hydroelectric plants use the water and the lake provides irrigation to 1,500 km² of land.

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