lake Sénin
Savièse, Switzerland
Lac de Sanetsch (also Lac de Sénin, Sanetsch See) is a reservoir below Sanetsch Pass in Valais, Switzerland. Its surface area is 29 ha (72 acres). The Sanetsch dam was built in 1965. The gravity dam has a height of 42 metres (138 ft).
Reservoir data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).