Lac de Coiselet (French pronunciation: [lak kwazlɛ]) is a reservoir on the border between the Ain and Jura departments in France. Its surface area is 3.8 km2. The lake formed in 1970 after the Barrage de Coiselet was built at the confluence of the rivers Ain and Bienne.

Lac de Coiselet
Lac de Coiselet is located in Ain
Lac de Coiselet
Lac de Coiselet
LocationAin/Jura
Coordinates46°19′40″N 5°37′00″E / 46.32778°N 5.61667°E / 46.32778; 5.61667
Typereservoir
Primary inflowsAin, Bienne
Primary outflowsAin
Basin countriesFrance
Max. length6 km (3.7 mi)
Surface area3.8 km2 (1.5 sq mi)
Average depth9.5 m (31 ft)
Max. depth30 m (98 ft)

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