Gråsjøen[2] is a lake/reservoir in Surnadal Municipality in Møre og Romsdal county, Norway (and a very small part in the northeastern corner of the lake is in Rindal Municipality in Trøndelag county).

The lake is located in the northern part of the Trollheimen mountain range.

The lake is dammed and the water is used in the Gråsjø power station.

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