Moscow is the capital and most populous city in Russia, with about 13 million residents it its city limits and more than 20 million in its metropolitan area. The city is organized into five concentric transportation rings that surround the Kremlin, all of which can be seen here. Moscow sits on the Moskva River, which is connected by canal to the Volga River, ultimately giving the capital city access to five seas: the White Sea, Baltic Sea, Caspian Sea, Sea of Azov, and the Black Sea.