Botnedalsvatn is a lake in Tokke Municipality in Telemark county, Norway.

The 3.12-square-kilometre (1.20 sq mi) lake is located in the Botnedalen valley, about 12 kilometres (7.5 mi) to the northwest of the village of Dalen.

The lake is used as a reservoir for the nearby Byrte Hydroelectric Power Station.

Water flows from this lake through a tunnel into the power plant which is located at the southern end of the nearby lake Byrtevatn.

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