The Amur River is a river in East Asia that flows through Russia, China, and Mongolia. It is the longest river in the Russian Far East and the ninth longest river in the world. The Ural River is a river in Russia and Kazakhstan that flows from the Ural Mountains to the Caspian Sea. It is the third longest river in Europe after the Volga and the Danube. Both the Amur and Ural Rivers are major rivers in Asia.