Khorgo Mountain is a dormant volcano which lies on the east of the Terkhiin Tsagaan Lake.

The Khorgo crater, situated at an altitude of 2.210 meters with a diameter of 20 meters and depth of 70 to 80 meters, is the most interesting of all. The Khorgo volcano is covered with basalt. The northern slope is covered with Siberian Larch (Larix sibirica). It has been protected since 1965, fully in 1997, to safeguard spectacular mountain scenery and endangered fauna and flora.