Tuva or Tyva, officially the Republic of Tuva, is a republic of Russia. Tuva lies at the geographical center of Asia, in southern Siberia. The republic borders the federal subjects of the Altai Republic, Buryatia, Irkutsk Oblast, Khakassia, and Krasnoyarsk Krai, and shares an international border with Mongolia to the south. Tuva has a population of 336,651. Its capital city is Kyzyl, in which more than a third of the population reside.