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An ancient lake is a lake that has consistently carried water for more than one million years. 12 of the 20 ancient lakes have existed for more than 2.6 million years, the full Quaternary period. Ancient lakes continue to persist due to plate tectonics in an active rift zone. This active rift zone creates lakes that are extremely deep and difficult to naturally fill with sediment. Due to the prolonged life of ancient lakes, they serve as models for isolated evolutionary traits and speciation. Most of the world's bodies of water are less than 18,000 years old. There are only 20 ancient lakes over 1 million years old.[1]
Lake Baikal is often considered the oldest, as clear evidence shows that it is 25–30 million years old.[2][3] Lake Zaysan may be even older, of Cretaceous origin and at least 66 million years old[4] (most likely around 70 million years[5]), but its exact age is controversial and labelled with some uncertainty.[6] Another contender for oldest is Lake Maracaibo, estimated to be 20–36 million years old. In ancient times it was indisputably a true lake, but today it is saline and directly connected to the sea, leading many to consider it a large lagoon or bay.[7]
^Cite error: The named reference marine-rutgers was invoked but never defined (see the help page).
^"Lake Baikal – UNESCO World Heritage Centre". 1992–2024. Retrieved 20 January 2024. Situated in south-east Siberia, the 3.15-million-ha Lake Baikal is the oldest (25 million years) and deepest (1,700 m) lake in the world. It contains 20% of the world's total unfrozen freshwater reserve.
^"Lake Baikal: Protection of a unique ecosystem". ScienceDaily. 26 July 2017. Retrieved 8 March 2018.
^Lucas; Bray; Emry; Hirsch (2012). "Dinosaur eggshell and Cretaceous-Paleogene Boundary in the Zaysan Basin, eastern Kazakhstan". Journal of Stratigraphy. 36 (2): 1376–1382. doi:10.1016/j.proenv.2011.09.220.
^Dorfman, B.F. (2011). "Zaysan-the Only Surviving Cretaceous Lake-May be Lost". Procedia Environmental Sciences. 10 (B): 1376–1382. doi:10.1016/j.proenv.2011.09.220.
^"The Oldest Lakes in the World". World Atlas. 25 August 2017. Retrieved 8 March 2018.
^"Lake Maracaibo – Lakes of the World". World Atlas. Retrieved 8 March 2018.
An ancientlake is a lake that has consistently carried water for more than one million years. 12 of the 20 ancientlakes have existed for more than 2...
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