Yakutsk is the capital and largest city of Sakha, Russia, located about 450 km south of the Arctic Circle. Fueled by the mining industry, Yakutsk …Yakutsk is the capital and largest city of Sakha, Russia, located about 450 km south of the Arctic Circle. Fueled by the mining industry, Yakutsk has become one of Russia's most rapidly growing regional cities, with a population of 355,443 at the 2021 census.