The Aimag is largely mountainous. The south and southwest are dominated by the round-topped Tarvagatai, Bulnain and Erchim sub-ranges of the Khangai massif. The areas west and north of Lake Khövsgöl are formed by the alpine Khoridol Saridag, Ulaan Taiga, and Mönkh Saridag mountains. The center and east are less mountainous, but still hilly.