The park is situated in the valley of the Chuluut River and Suman River in the Tarvagatai Range of the Khangai Mountains.
 Lake Terkhiin Tsagaain is a freshwater, oligotrophic lake in a volcanically-formed valley.
 The terrain immediately around the lake is hills with steppe and forest steppe vegetation.
 The lake is about 15 km long.
 It has a maximum depth of 20 meters, with 40% being less than 2 meters deep.

Khorgo Mountain is about 4 km east of the lake, in the Taryatu-Chulutu valley, a volcanic field.
 Khorgo experienced a significant eruption in approximately 8,000 BCE.
The park is situated in the valley of the Chuluut River and Suman River in the Tarvagatai Range of the Khangai Mountains.  Lake Terkhiin Tsagaain is a freshwater, oligotrophic lake in a volcanically-formed valley.  The terrain immediately around the lake is hills with steppe and forest steppe vegetation.  The lake is about 15 km long.  It has a maximum depth of 20 meters, with 40% being less than 2 meters deep.
Khorgo Mountain is about 4 km east of the lake, in the Taryatu-Chulutu valley, a volcanic field.  Khorgo experienced a significant eruption in approximately 8,000 BCE.
Khorgo-Terkhiin Tsagaan Nuur National Park