Lac de Sauvabelin is an artificial lake in the Sauvabelin forest, above Lausanne, Switzerland. The city of Lausanne authorized the construction of the lake in 1888.
Wikipedia https://en.wikipedia.org/wiki/Lac_de_Sauvabelin
Address 1 Chemin des Celtes, 1018, Switzerland
Coordinates 46°32'15.461" N 6°38'17.571" E