Øvrevatnet

Øvrevatnet or Øvervatnet is a meromictic lake (contains anoxic seawater at 40 metres deep, and further down) that lies in, Fauske Municipality in Nordland county, Norway. The lake lies about 6 km east of the town of Fauske. Its water is fresh just down to 10-15 m. From that level the water gets more salty. Øvrevatnet is also much polluted by mining industry operations upstream in earlier times. The 11 km2 lake flows out into the neighboring lake Nedrevatnet to the west.