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320,000 Olympic swimming pools
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The Lac de Serre-Ponçon in the Alpes-de-Haute-Provence department extends over 12.4 miles (20 km) in length and 1.8 miles (3 km) in width at its maximum water level. It covers an area of 6,920 acres (2,800 ha), the equivalent of 1,555 football fields, and constitutes a reserve of 1.27 billion m3 of water, or the equivalent of 320,000 Olympic swimming pools.
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