Lac de Joux is a lake in the Vallée de Joux in the Canton of Vaud, Switzerland. With a surface area of 9.5 km², it is the largest lake in Switzerland lying above 1,000 metres. Lac de Joux is located in the Jura Mountains.
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Address 1345, Switzerland
Coordinates 46°38'20.083" N 6°17'13.448" E