The Caspian Sea: Geography, Features and Significance

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Key takeaways

The Caspian Sea is the world largest inland body of water, containing approximately 78,200 cubic km of water.
Five nations border it, namely Russia, Kazakhstan, Turkmenistan, Iran, and Azerbaijan.
Rivers like the Volga, Ural, and Terek supply approximately 88% of the river inflow into the basin.
Water levels have declined by roughly 2 metres since the 1990s due to upstream damming and climate-driven evaporation.

A naval blockade is disrupting operations across southern maritime ports and the Strait of Hormuz.
Because of this disruption, Iran has shifted oil exports and critical cargo transit north to the Caspian Sea.

It is the world largest inland body of water and is classified as an endorheic lake or full-fledged inland sea.
It contains approximately 78,200 cubic km of water, which is nearly one-third of the total inland surface water on Earth.
It sits at the junction of Europe and Asia, lying east of the Caucasus Mountains, west of the Central Asian steppe, and north of the Iranian plateau.
Five nations border it, namely Russia, Kazakhstan, Turkmenistan, Iran, and Azerbaijan.

This massive enclosed inland water body covers approximately 386,400 sq km.
It lies 27 metres below sea level and drains a 3.6-million-sq-km catchment without any ocean outlet.
Its depth varies across a tripartite profile, featuring a shallow northern basin averaging 4 to 8 metres, a moderately deep central basin, and a southern basin reaching a maximum depth of 1,025 metres.
Rivers like the Volga, Ural, and Terek supply approximately 88% of the river discharge, making northern freshwater inflows crucial to its hydrological balance.
Upstream damming and climate-driven evaporation are accelerating Water Level Depletion.
Recent annual water level falls have exceeded 20 cm, showing an overall decline of roughly 2 metres since the 1990s.
As a remnant of the ancient Paratethys Sea, the Caspian Sea became isolated when geological changes severed its former connections with the Black Sea and Mediterranean.

Substantial offshore oil and natural gas reserves support regional energy production, pipelines, and maritime trade, giving the region considerable geopolitical importance.
It provides a vital maritime link in the International North-South Transport Corridor, connecting Indian Ocean trade through Iran with Russia, Central Asia, and northern Europe.