Choibalsan is the fourth-largest city in Mongolia after Ulaanbaatar, Darkhan, and Erdenet. The name of the city was Bayan Tümen until 1941, when it was renamed after the communist leader Khorloogiin Choibalsan in honor of the 20th anniversary of the Mongolian Revolution of 1921. It is the capital of the province of Dornod with the city's administrative unit named as Kherlen sum, enclosing an area of 281 square kilometres or 108 square miles. It is situated at the Kherlen River, at an elevation of 747 metres or 2,451 feet above sea level.