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Grimsel Oberaarsee.jpg
Location Guttannen, Canton of Berne
Coordinates 46°33′N 8°16′E / 46.550°N 8.267°E / 46.550; 8.267Coordinates: 46°33′N 8°16′E / 46.550°N 8.267°E / 46.550; 8.267
Type reservoir
Catchment area 19.4 km2 (7.5 sq mi)
Basin countries Switzerland
Max. length 2.8 km (1.7 mi)
Surface area 1.47 km2 (0.57 sq mi)
Max. depth 90 m (300 ft)
Surface elevation 2,303 m (7,556 ft)

Oberaarsee is a hydroelectric reservoir in the Grimsel area, part of the municipality of Guttannen, Switzerland. Its surface area is 1.47 km2 (0.57 sq mi). The Oberaar dam was completed in 1953, and is operated by Kraftwerke Oberhasli. It is drained by the Oberaarbach, which flows into the Grimselsee.

The Oberaar glacier is located west of the lake.


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