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The Caspian Sea is the world's largest inland body of water, described as the world's largest lake and usually referred to as a full-fledged sea. [2] [3] [4] An endorheic basin, it lies between Europe and Asia: east of the Caucasus, west of the broad steppe of Central Asia, south of the fertile plains of Southern Russia in Eastern Europe, and north of the mountainous Iranian Plateau.
Therefore, mean depth figures are not available for many deep lakes in remote locations. [9] The average lake on Earth has the mean depth 41.8 meters (137.14 feet) [9] The Caspian Sea ranks much further down the list on mean depth, as it has a large continental shelf (significantly larger than the oceanic basin that contains its greatest depths).
[1] [2] The lagoon has a variable surface area typically about 18,000 km 2 (6,900 sq mi). [2] It is very shallow, with an average depth of 10 meters. It is separated from the Caspian Sea by a narrow, rocky ridge having a very narrow opening through which the Caspian Sea waters flow into it.
There has been a bit of low-level controversy on the lake lists over time as to whether the Caspian Sea should be listed as a lake or as a sea (or perhaps an 'inland ocean'). The main voice advocating for keeping the Caspian out of the main lists (by depth, area, volume, etc.) has been Kwamikagami.
Aral Sea, formerly the third largest lake in the world, with an area of 68,000 km 2 (26,300 sq mi) Lake Chad, formerly the eleventh largest lake in the world, with an area of 26,000 km 2 (10,000 sq mi) Lake Urmia, formerly with an area of 5,200 km 2 (2,000 sq mi), but down to a tenth that size in 2017. It has since increased in area under a ...
3,755 km 2 (1,450 sq mi) 642 km 3 (154 cu mi) 2.3% Erie Canada, United States. North American Great Lakes: 25,667 km 2 (9,910 sq mi) 488 km 3 (117 cu mi) Fresh Khövsgöl Mongolia. Nearby the eastern, Sayan Mountains: 2,760 km 2 (1,070 sq mi) 381 km 3 (91 cu mi) Fresh Winnipeg Canada. Manitoba: 24,514 km 2 (9,465 sq mi) 294 km 3 (71 cu mi) Fresh
The water level of the Caspian Sea has varied within 4 m over a period of 30 years. Water levels in the Caspian Sea down to true altitude of -29 m reduce the depth of the lower Volga and restrict ship movement in this part of the Volga-Don Waterway.
The surface of the lake is 455.5 m (1,494 ft) above sea level, while the bottom of the lake is 1,186.5 m (3,893 ft; 648.8 fathoms) below sea level, and below this lies some 7 km (4.3 mi) of sediment, placing the rift floor some 8–11 km (5.0–6.8 mi) below the surface, the deepest continental rift on Earth. [5]