Explanation Ural Mountains (Separates Asia from Europe): A natural boundary between European Russia and Asian Russia.
Ural River (Separates Asia from Europe): Flows from the Ural Mountains into the Caspian Sea, marking part of the Europe-Asia boundary.
Caspian Sea (Separates Asia from Europe): Acts as a natural boundary between European Russia and Asian Kazakhstan.
Caucasus Mountains (Separates Asia from Europe): The Greater Caucasus Range is considered the southern boundary between Europe and Asia.
Black Sea (Does NOT separate Asia from Europe): The Black Sea lies entirely within Europe and does not serve as a boundary between Europe and Asia. The Bosphorus Strait, Sea of Marmara, and Dardanelles form the Europe-Asia divide in Turkey, not the Black Sea itself.
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