Tsetserleg (Mongolian: Цэцэрлэг, garden) 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). 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.
Tsetserleg has an airport, with regular connections from and to Ulan Bator, a theatre, hotel, hospital, and an agricultural college. The main industry is food processing. Tsetserleg has a borderline humid continental climate (Dwb). It is part of a microclimate in the center of Mongolia which experiences the most mild weather in the country, not too hot in the summer and not too cold in the winter. In the coldest month of winter, January, it is often the warmest place in the country and temperatures rarely plummet below -30°C, often hovering at around -20°C to -25°C during nighttime and 0°C to -15°C during daytime. It belongs to USDA Plant Hardiness Zone 5.