Moscow (Russian: Москва́, tr. Moskva) is the capital and largest city of Russia. It is a federal city and is the most populous federal subject of Russia. With a population of over 11,900,000 within the city limits, Moscow is one of the world's largest cities proper. The Moscow metro area has a population of about 16 million and makes up the northernmost megacity in the world. Moscow makes up a significant part of Russia's economy and contains a disproportionate amount of development to the rest of Russia, as a result of Soviet centralization.Moscow was founded in 1147 and developed as a trading post on the Moscow River, which flows into the Oka and Volga. It emerged as one of the more powerful Russian cities after Mongol lords gave it privileges in tribute collection. Later, the Grand Duchy of Moscow dominated and unified the Russian states, and Moscow became Russia's next great political center after Kiev and Novgorod. Although Peter the Great moved the capital to Saint Petersburg in 1712, Moscow remained a major city. Vladimir Lenin moved the capital back to Moscow in 1924, and during Soviet times its population increased from just over 2 million to 10 million in 1991. Today, its population continues to increase as people move in from poorer areas of Russia due to the city's high standards of living and economic opportunities.