Kuma-Manych Depression and Manych River from space
Upper left is the eastern tip of the Sea of Azov and lower right is the Caspian Sea
Upper right is the Volga and lower left is the Kuban River
The Kuma–Manych Depression (Russian: Кумо–Манычская впадина, Kumo–Manychskaya vpadina), is a geological depression in southwestern Russia that separates the Russian Plain (north) from the Fore-Caucasus (south). It is named after the Kuma and Manych rivers.
It is sometimes regarded as a definition for the natural boundary between Europe and Asia, although most modern sources use the Greater Caucasus watershed instead.
The Rostovsky Biosphere Reserve is located within the Depression.
Coordinates: 45°42′54″N 44°06′18″E / 45.71500°N 44.10500°E