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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).
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.
7 m 23 ft 14.1 km 3 3.4 cu mi A remnant of the prehistoric, Glacial Lake Agassiz together with: Winnipeg and Winnipegosis. 32: Taymyr Russia: Fresh 4,560 km 2 1,760 sq mi 250 km 160 mi 26 m 85 ft 12.8 km 3 3.1 cu mi Largest lake entirely within the Arctic Circle. 33: Qinghai China: Saline 1.4% (variable) 4,489 km 2 1,733 sq mi (2007) 32.8 m 108 ft
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.
The salinity of the lagoon is on average about 35%, compared to 1.2% in the Caspian Sea and between 3% and 4% in oceans worldwide. [4] Due to the exceptionally high salinity, comparable to the Dead Sea , it has little to no marine vegetation.
'Lakes by depth' is not a common comparison, but 'lakes by area' (what most people mean by one lake being bigger than another) is a common comparison, and even in popular usage the rankings ("X is the 4th largest lake" etc.) often only make sense if the Caspian is excluded.
It is also Europe's largest river in terms of average discharge at delta – between 8,000 m 3 /s (280,000 cu ft/s) and 8,500 m 3 /s (300,000 cu ft/s) – and of drainage basin. It is widely regarded as the national river of Russia .
Diminishing of surface of Lake Urmia Lake Urmia, NW Iran, September 2015. Lake Urmia [a] is an endorheic salt lake in Iran. [7] [8] The lake is located between the provinces of East Azerbaijan and West Azerbaijan in Iran, and west of the southern portion of the Caspian Sea.