It is a remnant of the ancient Tethys Ocean and became landlocked about 5 million years ago due to continental drift.
Caspian sea is in the eastern hemisphere of seas and oceans
Black and Caspian seas
Caucasus Mountains separate the Black Sea and the Caspian Sea.
Some inland seas include the Caspian Sea and the Great Lakes.
Azerbaijan
Caspian, Dead, Aral, Black seas.
Mediterranean, Black, Caspian, Arabian, and Red Seas
Between the Black and Caspian Seas.
They are bodies of water, all seas.
Caucasus
The Caspian Sea and the Aral Sea
Caspian Sea, and Sea of Oman.