| Arnensee | |
|---|---|
| Lac d'Arnon | |
 | |
  Arnensee  Arnensee  Arnensee | |
 map | |
| Location | Gsteig, Canton of Bern |
| Coordinates | 46°23′17.54″N 7°13′0.4″E / 46.3882056°N 7.216778°E |
| Type | reservoir |
| Primary inflows | Tschärzisbach |
| Primary outflows | Tschärzisbach |
| Catchment area | 7.1 km2 (2.7 sq mi) |
| Basin countries | Switzerland |
| Max. length | 1.5 km (0.93 mi) |
| Surface area | 0.456 km2 (0.176 sq mi) |
| Max. depth | 50 m (160 ft) |
| Water volume | 10.5 million cubic metres (8,500 acre⋅ft) |
| Surface elevation | 1,542 m (5,059 ft) |
 | |
Arnensee (French: Lac d'Arnon) is a lake in canton of Bern, Switzerland. The lake in the municipality of Gsteig is used as a reservoir by Romande Energie. The dam was built in 1942. Its volume is 10.5 mio m³ and surface area 0.456 km2.