Nesjøen[3] is an artificial lake (reservoir) in Tydal Municipality in Trøndelag county, Norway.

The results of the new, combined lake would be a 66-square-kilometre (25 sq mi) reservoir holding about 340,000,000 cubic metres (440,000,000 cu yd) of water.

The lake Nesjøen has a total watershed feeding it of about 712 square kilometres (275 sq mi).

Esandsjøen became regulated for hydroelectric power production by Trondheim Energiverk with the construction of a dam at Esna that was built from 1941 until 1947.

In 1971, another nearby dam was built and that lake gradually enlarged until it essentially merged with the Esandsjøen.