Mjøsundvatnet[2] is a lake in Namsos Municipality and Nærøysund Municipality in Trøndelag county, Norway.

The 8.76-square-kilometre (3.38 sq mi) lake lies in the far northern part of Namsos, and it extends a short distance into Nærøysund on both ends.

The lake is accessible by road from Salsbruket in Nærøysund Municipality.

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