Abakan (əbəkänˈ) [key], city (1990 est. pop. 153,000), capital of the Khakass Republic, in S central Siberian Russia, on the Yenisei River. A commercial center on the South Siberian RR, it produces footwear, foodstuffs, and metal products. Founded (1707) as a fortress, Abakan was known as Ust-Abakanskoye until 1931. Bronze Age tumuli and Turkic inscriptions have been found in the city.