Soviet Union
The Soviet Union's (and now Russia's) longest rivers are the Yenisey, Ob/Irtysh, Amur and Lena. The Soviet Union's highest mountain was Communism Peak (today it is called the Ismoil Somoni Peak) in Tajikistan measured at . The world's largest lake, the Caspian Sea, was mostly in the Soviet Union. as well as the world's deepest lake, Lake Baikal.