BOB GIBBONS / SCIENCE PHOTO LIBRARY BOB GIBBONS / SCIENCE PHOTO LIBRARY
Serre-Poncon Lake. Aerial view of the Serre Poncon Lake in the Hautes Alpes, France. This large reservoir was formed by a dam built as part of a series of river control measures that were taken after the disastrous floods in Frejus in the 1960s. The dam housed a small hydroelectric power station.
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