Siberia (Russian: Сиби́рь, Sibir; Tatar: Seber) is a vast region on the eastern and North-Eastern part of the Russian Federation 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 national 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 27% of Russia's population (39 million people) .