Rotvatnet or Nervatnet (Norwegian) or Ruohtsajávrre (Lule Sami)[2] is a lake in Hamarøy Municipality in Nordland county, Norway.

The lake lies just west of the village of Tømmerneset.

The European route E6 highway runs along the eastern shore of the lake.

The lake Strindvatnet lies to the south of this lake.

This article related to a lake in Nordland in Norway is a stub.