Kuma–Manych Depression


The Kuma–Manych Depression, is a geological depression in southwestern Russia that separates the Russian Plain to the north from Ciscaucasia to the 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 some modern sources use the Greater Caucasus watershed instead.
The Rostovsky Biosphere Reserve is located within the Depression.