It is located in Nissedal and Kviteseid municipalities, and is Telemark's largest lake.

Nisser has the greatest average depth of the Norwegian lakes that is not a cryptodepression.

This makes it possible to travel the 50 km (31 mi) long stretch from Tveitsund to Vråliosen by boat.

[5] The widest part of the lake is found immediately south of Lauvlunduten, which is situated on the border between Nissedal and Kviteseid municipalities.

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