Lac des Rousses is a lake in Les Rousses, Jura department, Franche-Comté, France, close to the Vallée de Joux in Switzerland. The lake drains through the Orbe into Lac de Joux.
Wikipedia https://en.wikipedia.org/wiki/Lac_des_Rousses
Address 39220, France
Coordinates 46°30'14.695" N 6°5'24.626" E