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Siberia (, Sibir; ) is a vast region of Russia constituting almost all of Northern Asia and comprising a large part of the Euro-Asian Steppe. It extends eastward from the Ural Mountains to the Pacific Ocean, and southward from the Arctic Ocean to the hills of north-central Kazakhstan and the borders of both Mongolia and China. All but the extreme south-western area of Siberia lies in Russia, and it makes up about 77% of Russia's territory (13.1 million square kilometres), but only 30% of Russia's population (42.2 million people).