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Lake Grimsel
Karte Grimselsee.png
Location Guttannen, Canton of Berne
Coordinates 46°34′10.52″N 8°19′38.66″E / 46.5695889°N 8.3274056°E / 46.5695889; 8.3274056Coordinates: 46°34′10.52″N 8°19′38.66″E / 46.5695889°N 8.3274056°E / 46.5695889; 8.3274056
Type artificial lake, hydroelectric reservoir
Primary inflows Oberaarbach, Treibtenbach
Primary outflows Aare
Catchment area 74.4 km2 (28.7 sq mi)
Basin countries Switzerland
Surface area 2.63 km2 (1.02 sq mi)
Water volume 95 million cubic metres (77,000 acre·ft)
Surface elevation 1,908 m (6,260 ft)

The Grimselsee or Lake Grimsel is an artificial lake near the Grimsel Pass in the Canton of Berne, Switzerland. With a volume of 95 mio m³, it is larger than other hydroelectric reservoirs in the region: Oberaarsee, Räterichsbodensee and Gelmersee. The dam was completed in 1932 and is operated by Kraftwerke Oberhasli AG (KWO). It is located in the municipality of Guttannen.

Lake Grimsel and Räterichsbodensee in the background.

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