Yakutsk (; , Jokuskai, ) is the capital city of the Sakha Republic, Russia, located about south of the Arctic Circle. Population:
Yakutsk is a major port on the Lena River. It is served by the Yakutsk Airport as well as the smaller Magan Airport. It is a major supplier of diamonds. Its population is almost 300,000 and its average winter temperature is . If the 3 million km² Sakha Republic were a sovereign nation, rather than a federal subject of Russia, its capital, Yakutsk, would be the coldest national capital as well as the coldest major city in the world.