Salvatnet is a

lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...

in the

municipalities A municipality is usually a single administrative division having corporate status and powers of self-government or jurisdiction as granted by national and regional laws to which it is subordinate. The term ''municipality'' may also mean the go ...

Namsos ( sma, Nåavmesjenjaelmie) is a municipality in Trøndelag county, Norway. It is part of the Namdalen region. The administrative centre of the municipality is the town of Namsos. Some of the villages in the municipality include Bangsund, Kl ...

and

Nærøysund Nærøysund is a municipality in Trøndelag county, Norway. It is located in the traditional district of Namdalen. The municipality was established on 1 January 2020 after the merger of the old municipalities of Vikna and Nærøy. The municipali ...

Trøndelag Trøndelag (; sma, Trööndelage) is a county in the central part of Norway. It was created in 1687, then named Trondhjem County ( no, Trondhjems Amt); in 1804 the county was split into Nord-Trøndelag and Sør-Trøndelag by the King of Denmar ...

county A county is a geographic region of a country used for administrative or other purposesChambers Dictionary, L. Brookes (ed.), 2005, Chambers Harrap Publishers Ltd, Edinburgh in certain modern nations. The term is derived from the Old French ...

Norway Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and t ...

. With its deepest depth of , it is Norway's and

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...

's second-deepest lake, after

Hornindalsvatnet Hornindalsvatnet is Norway's and Europe's deepest lake, and the world's twelfth deepest lake, officially measured to a depth of . Its surface is above sea level, which means that its bottom is below sea level. The village of Grodås lies at ...

. 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 A meromictic lake is a lake which has layers of water that do not intermix. In ordinary, holomictic lakes, at least once each year, there is a physical mixing of the surface and the deep waters. The term ''meromictic'' was coined by the Austri ...

, meaning that the water is permanently stratified, often without

oxygen Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as wel ...

in the lower depths (

bottom water Bottom water is the lowermost water mass in a water body, by its bottom, with distinct characteristics, in terms of physics, chemistry, and ecology. Oceanography Bottom water consists of cold, dense water near the ocean floor. This water is charac ...

) due to

density gradient Density gradient is a spatial variation in density over an area. The term is used in the natural sciences to describe varying density of matter, but can apply to any quantity whose density can be measured. Aerodynamics In the study of supersonic ...

and a lack of turnover. A meromictic lake often preserves records of the geologic past. The lower layer of the lake is highly

saline Saline may refer to: * Saline (medicine), a liquid with salt content to match the human body * Saline water, non-medicinal salt water * Saline, a historical term (especially US) for a salt works or saltern Places * Saline, Calvados, a commune in ...

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.

References

Namsos Nærøysund Lakes of Trøndelag Meromictic lakes {{Trøndelag-geo-stub

See also

References