Salvatnet
Salvatnet is a lake in the municipalities of Namsos and Nærøysund in Trøndelag county, Norway. With its deepest depth of, it is Norway's and Europe's second-deepest lake, after Hornindalsvatnet. Alternate sources give the depth as either or at the deepest point. The lake sits very close to the ocean, about above sea level at the surface and reaches to a depth of below sea level. It is a very large lake with an area of, a volume of, and a shoreline that is around.
Salvatnet is a meromictic lake, meaning that the water is permanently stratified, often without oxygen in the lower depths due to density gradient and a lack of turnover. A meromictic lake often preserves records of the geologic past. The lower layer of the lake is highly saline and as a result denser than the higher levels of water. Other meromictic lakes in Norway with old seawater in the lower depths include Kilevann, Tronstadvann, Botnvatnet, Rørhopvatnet, and Rørholtfjorden.
