Langvassåga[1] is a river that flows out of the lake Langvatnet in Rana Municipality in Nordland county, Norway.

It flows in a southeastern direction and almost immediately, it is joined by the river Røvassåga.

It then continues a short distance southwards before joining the main river Ranelva, just south of the village of Røssvoll.

The Langvassåga catchment area covers about 1,114 square kilometres (430 sq mi).

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