(called federal subjects): twenty-two republics, nine krais (territories), forty-six oblasts (provinces), one autonomous oblast, four autonomous okrugs, and three cities with federal status, namely the cities of Moscow, Saint Petersburg, and Sevastopol. The republics include a wide variety of peoples, including northern Europeans, Tatars, Caucasus peoples, and indigenous Siberians. The largest federal subjects are in Siberia. Located in east-central Siberia, the Sakha Republic (Yakutia) is the largest federal subject in the country (and the largest country subdivision in the world), twice the size of Alaska. Second in size is Krasnoyarsk Krai, located west of Sakha in Siberia. Kaliningrad Oblast, which is a noncontiguous constituent entity of Russia, is the smallest oblast. The Republic of Ingushetia is both the smallest republic and the smallest federal subject of Russia except for the three federal cities. The two most populous federal subjects, Moscow Oblast (with Moscow) and Krasnodar Krai, are in European Russia. Human geography Demographics Russia had a population of 142.8 million according to the 2010 census, which rose to 146.2 million as of 2021 following the annexation of Crimea in 2014. It is the most populous country in Europe, and the ninth-most populous country in the world; with a population density of 9 inhabitants per square kilometre (23 per square mile). Urban areas Russia is one of the world's most urbanized countries, with roughly 75% of its total population living in urban areas. Moscow, the capital and largest city, has a population estimated at 12.4 million residents within the city limits, while over 17 million residents in the urban area, and over 20 million residents in the metropolitan area. Moscow is among the world's largest cities, being the most populous city entirely within Europe, the most populous urban area in Europe, the most populous metropolitan area in Europe, and also the largest city by land area on the European continent. Saint Petersburg, the cultural capital, is the second-largest city, with a population of roughly 5.4 million inhabitants. Other major urban areas are Yekaterinburg, Novosibirsk, Kazan, Nizhny Novgorod, and Chelyabinsk. Physiography and hydrography Geographers traditionally divide the vast territory of Russia into five natural zones: the tundra zone; the Taiga, or forest, zone; the steppe, or plains, zone; the arid zone; and the mountain zone. Most of Russia consists of two plains (the East European Plain and the West Siberian Plain), three lowlands (the North Siberian, the Central Yakutian and the East