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The Lac de Serre-Ponçon is in southeast France, it is the largest artificial lake in Europe. The lake gathers the waters of the Durance and the Ubaye, 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. The lake is 20 km long and has a maximum width of 3 km, in area it is around 28 km² and holds 1.2 km³ of water.
The lake was created to control water flow, disastrous floods have caused severe damage and loss of live in 1843 and 1856. First proposed in 1895 construction started in 1955 and was completed by 1961, around 3 million m3 of material was moved. As well as water control, sixteen hydroelectric plants use the water and the lake provides irrigation to 1,500 km² of land.