• Khorgo volcanic crater

East of Terkhiin Tsagaan Nuur Lake is the extinct crater of the Khorgo volcano, which is responsible for the birth of the lake as the lava blocked the flow of a river, creating a natural dam.

The Khorgo volcano is located at an altitude of 2200 meters, its slopes are covered with basalt and its crater forms an almost perfect cone of 200 meters in diameter and 100 meters deep.

Its last eruption was 8000 years ago, it was the last active volcano in Mongolia.