Caspian Sea: The world's largest inland body of water, it is an endorheic basin.

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An endorheic basin is a closed drainage basin that has no outlet to the ocean, with water instead collecting in the lowest part of the basin, often forming lakes, or evaporating and seeping into the ground. Water is contained within the basin, with precipitation and runoff being the only sources of inflow. Over time, the constant evaporation of water from these basins concentrates minerals, leading to high salinity and the formation of salt pans and salt lakes.
 

Key Characteristics

• No Outlet:

  Unlike most drainage basins, which have outlets to rivers and oceans, endorheic basins are internally drained. 

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Examples

• Great Basin (U.S.): A well-known example of an endorheic basin in the Western U.S. 
  
  

Water Collection:

Water from rain and rivers flows into the basin and collects in a terminal lake or depression. 

Evaporation & Seepage:

Water leaves the basin primarily through evaporation or seepage into the ground, rather than flowing to the sea. 

Salt Accumulation:

As water evaporates, it leaves behind dissolved minerals, resulting in high salinity and the formation of salt lakes. 

Caspian Sea: The world's largest inland body of water, it is an endorheic basin. 

Lake Eyre (Australia): The largest endorheic basin in Australia.