Lac d'Aiguebelette, Natural lake and rowing venue in Lépin-le-Lac, France

Lac d'Aiguebelette is a natural lake in the Savoyard Alps with clear blue-green water and steep shorelines on several sides. The water is surrounded by forests and mountain terrain that slopes upward from the banks.

The basin was carved by the Würm glacier at the foot of the Chaîne de l'Épine fault, then filled as the ice melted, with moraine and molassic hills closing it off. Around 9700 BC a landslide on the north-west shore triggered a wave estimated at 3.5 m across the lake. The water is private, shared by the Rivérieulx de Chambost de Lépin family and EDF, who delegated management to the lake's commune community.

The lake is privately owned by the Rivérieulx de Chambost de Lépin family and Électricité de France, who delegated its management to the communauté de communes du Lac d'Aiguebelette. On La Grande Île, the Chapelle Saint-Vincent belongs administratively to Lépin-le-Lac. The lake hosted the 1997 and 2015 World Rowing Championships.

Motorboats have been banned since a 1976 ruling, so the water stays quiet and the shoreline wildlife is left undisturbed. The Saint-André-le-Gaz to Chambéry railway runs along the lake, and the stretch between Lépin-le-Lac-La Bauche and Aiguebelette-le-Lac stations gives views over the water. The A43 autoroute passes north of the lake.

The two southern islands, La Petite Île and La Grande Île, are not inhabited: the larger one holds the Chapelle Saint-Vincent, administratively part of Lépin-le-Lac, and both are ringed by reed beds. The lake's surface froze completely in the winters of 1909, 1929, 1941, 1942 and 1956.