Tsetserleg, Mongolia is the capital of Arkhangai Aimag (province) in Mongolia. It lies on the northeastern slopes of the Khangai Mountains, 360 miles (600 km) southwest of Ulaanbaatar. It has a population of 16,553 (2000 census, with Erdenebulgan sum rural territories population was 18,519), 16,618 (2003 est.), 16,300 (2006 est.). Tsetserleg is geographically located in the Bulgan sum in the south of the aimag. It is not to be confused with Tsetserleg sum in the north. In 1992 Tsetserleg was designated as Erdenebulgan sum, which has area of 536 km².