Siberia (/saɪˈbɪəriə/; Russian: Сиби́рь, Sibir'; ) is an extensive region constituting almost all of North Asia. Comprising the central and eastern portion of the Russian Federation, Siberia was part of the Soviet Union (USSR) from its beginning, as its predecessor states, the Tsardom of Russia and the Russian Empire since 16th century.
Encompassing much of the Eurasian Steppe, the territory of Siberia extends eastward from the Ural Mountains to the watershed between the Pacific and Arctic drainage basins, and southward from the Arctic Ocean to the hills of north-central Kazakhstan, then to the national borders of Mongolia and China. Siberia makes up about 77% of Russia's territory (13.1 million square kilometres), but is home to only 28% (40 million people) of Russia's population.
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