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Location Kerns, Obwalden
Coordinates 46°46′25″N 8°18′22″E / 46.77361°N 8.30611°E / 46.77361; 8.30611Coordinates: 46°46′25″N 8°18′22″E / 46.77361°N 8.30611°E / 46.77361; 8.30611
Type reservoir
Primary inflows Tannenbach
Primary outflows Tannenbach
Catchment area 1.3 km2 (0.50 sq mi)
Basin countries Switzerland
Surface area 33 ha (82 acres)
Water volume 3.8 million cubic metres (3,100 acre·ft)
Surface elevation 1,976 m (6,483 ft)

Tannensee is a reservoir in Obwalden, Switzerland. In 1958, Tannenbach and few other creeks were dammed with an earth-fill dam. The reservoir has a volume of 3.8 mio m³ and its surface area is 33 ha (82 acres). The reservoir is used to generate electricity at Kraftwerk Hugschwendi in Kerns.

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