| Tannensee | |
|---|---|
| Location | Kerns, Obwalden |
| Lake type | reservoir |
| Primary inflows | Tannenbach |
| Primary outflows | Tannenbach |
| Catchment area | 1.3 km² |
| Basin countries | Switzerland |
| Surface area | 0.33 km² |
| Water volume | 3.8 mio m³ |
| Surface elevation | 1976 m |
Tannensee is a reservoir in Obwalden, Switzerland. In 1958, Tannenbach and few other creeks were dammed with an earth-fill dam. The lake has a volume of 3.8 mio m³ and its surface area is 0.33 km². The reservoir is used to generate electricity at Kraftwerk Hugschwendi in Kerns.