Yakutsk (Russian: Якутск, IPA: [jɪˈkutsk]; Sakha: Дьокуускай, D'okuuskay, pronounced [ɟokuːskaj]) is the capital city of the Sakha Republic, Russia, located about 450 kilometers (280 mi) south of the Arctic Circle. Population: 269,601 (2010 Census); 210,642 (2002 Census); 186,626 (1989 Census).Yakutsk is a major port on the Lena River. It is served by the Yakutsk Airport as well as the smaller Magan Airport. The region is a major source of diamonds. With an average temperature of −8.8 °C (16.2 °F), Yakutsk is the second coldest major city in the world after Norilsk, although Yakutsk experiences colder temperatures in the winter.