Russia is on the continents of Asia and Europe, according to About.com. The European part of Russia extends from its western border with Ukraine, Belarus, Finland and other European countries to the Ural Mountains. The area of Russia east of those mountains is in Asia.
Russia borders Azerbaijan, Belarus, China, Estonia, Finland, Georgia, Kazakhstan, North Korea, Latvia, Lithuania, Mongolia, Norway, Poland and Ukraine. Its longest border is with Kazakhstan, and its shortest is with North Korea. It also touches a number of bodies of water, including the White Sea, the Kara Sea, the Caspian Sea, the Black Sea, the Bering Sea and the Sea of Okhostk. Russia's domination of Siberia, the region across the Ural Mountains, began in earnest only after the Russians had thrown off the Mongol yoke in the 15th century A.D.