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', oblast (province), central Russia, occupying an area of 554,100 square miles (1,435,200 square km) in the Ob-Irtysh Basin. In the extreme west the Ural Mountains attain 6,217 feet (1,895 m) in Mount Narodnaya, but the remainder of the oblast's huge area is a low, exceptionally flat plain, with innumerable lakes and very extensive swamps. The oblast stretches from tundra in the north, with its scanty vegetation of mosses and lichens and poor soils, through dense swamp forests, or taiga, of spruce, fir, pine, larch, and birch, to forest-steppe with birch in the south. More than 80 percent of the area is occupied by the Khanty-Mansi and Yamalo-Nenets autonomous okruga (qq.v.). Tyumen city is the administrative centre of the oblast.