Bashkortostan, officially the Republic of Bashkortostan, sometimes also called Bashkiria, is a republic of Russia between the Volga river and the Ural Mountains in Eastern Europe. The republic borders Perm Krai to the north, Sverdlovsk Oblast to the northeast, Chelyabinsk Oblast to the east, Orenburg Oblast to the south, Tatarstan to the west and Udmurtia to the northwest. It covers 143,600 square kilometres. It is the seventh-most populous federal subject in Russia and the most populous republic. As of 2025, it has a population of 4,046,094. Its capital and largest city is Ufa.