Moscow ( /ˈmɒskaʊ/ or /ˈmɒskoʊ/; Russian: Москва, tr. Moskva; IPA: [mɐˈskva] ( listen)) is the capital and the most populous federal subject of Russia. The city is a major political, economic, cultural and scientific center in Russia and on the continent. Based on Forbes 2011, Moscow has the largest community of billionaires in the world.Moscow is the most northern megacity on Earth, the most populous city in Europe, side by side with Istanbul, and the 6th largest city proper in the world. It's also the largest city in Russia. Its population, according to the 2010 Census, is 11,514,330. Moscow is a "Megapolis" of about 20 million people, as Mayor Sergey Sobyanin stated. By its territorial expansion on July 1, 2012 southwest into the Moscow Oblast the capital amplified its area 2,5 times from about 1.000 qkm up to 2.500 qkm and won additional population of 230.000 people.