Glattalpsee
| Glattalpsee | |
|---|---|
| Location | Canton of Schwyz |
| Coordinates | 46°55′10″N 8°54′20″E / 46.91944°N 8.90556°E |
| Type | reservoir |
| Basin countries | Switzerland |
| Surface area | 39 ha (96 acres) |
| Surface elevation | 1,852 m (6,076 ft) |
Glattalpsee is a reservoir on the Glattalp plateau, above Bisisthal, in the municipality of Muotathal, Canton of Schwyz, Switzerland. The lake's water is used by the Sahli powerplant in Bisisthal to produce electricity.