Drevvatnet

Drevvatnet is a lake that lies in the municipality of Vefsn in Nordland county, Norway. The village of Drevvassbygda lies at the northeastern end of the lake, in the Drevjedalen valley. The Nordland Line railway follows the southern coast of the lake.
Name.
The first element is the name of the river Drevja and the last element is the finite form of "vatn" which means "lake".