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. See also List of lakes of Switzerland List of mountain lakes of Switzerland References External links Waterlevels of Lac de Joux at Le Pont Lakes of Switzerland Lakes of the canton of Vaud L Lac de Joux