A hypersaline lake is a landlocked body of water that contains significant concentrations of sodium chloride or other salts, with saline levels surpassing that of ocean water (3.5%, i.e. 35 grams per litre or 0.29 pounds per US gallon). Specific microbial and crustacean species thrive in these high salinity environments that are otherwise inhospitable to most lifeforms. Some of these species attain dormancy when they are desiccated, and organisms of certain species have been proposed to survive for over 250 million years. Hypersaline lakes also have a high level of Buoyancy due to their heavier salt content, making it easy for humans to float on the surface with minimal effort and without the aid of flotation devices.
The most saline water body in the world is the Don Juan Pond, located in the McMurdo Dry Valleys in Antarctica. It is limited in its size—about 3,000 cubic meters and its volume is changing. The Don Juan Pond has a salinity level of over 44%, (i.e. 12 times saltier than ocean water). Its high salinity prevents the Don Juan from freezing even when temperatures are below −50 °C (−58 °F). There are larger hypersaline water bodies, lakes in the McMurdo Dry Valleys such as Lake Vanda with salinity of over 35% (i.e. 10 times saltier than ocean water). They are covered with ice in the winter.
The most saline lake outside of Antarctica is Lake Assal, in Djibouti, which has a salinity of 34.8% (i.e. 10 times saltier than ocean water). Probably the best-known hypersaline lakes are the Dead Sea (34.2% salinity in 2010) and the Great Salt Lake (5–27% variable salinity). The Dead Sea, dividing Israel and the West Bank from Jordan, is the world's deepest hypersaline lake and the Araruama Lagoon is the world's largest hypersaline lake. The Great Salt Lake, located in Utah, while having nearly three times the surface area of the Dead Sea, is shallower and experiences much greater fluctuations in level than the Dead Sea. At its lowest recorded levels, it approaches 7.7 times the salinity of ocean water, but when its levels are high, its salinity drops to only slightly higher than the ocean.
Hypersaline lakes are found on every continent, especially in arid or semi-arid regions.
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