The Caspian Sea is the largest enclosed body of water on Earth, located between Europe and Asia. It is bordered by the ARAL Sea to the north, Azerbaijan's capital city Baku to the east, IRAN to the south, and Russia's Ural Mountains and Ural River to the west. The sea is fed by numerous rivers, including the Volga, Ural, Kura, and Terek Rivers, and is home to a variety of fish species, including sturgeon, carp, and herring. The Caspian Sea is also known for its high salinity, with the Iranian side having a higher concentration of salt than the Russian side.