Khorgo-Terkhiin Tsagaan Nuur National Park (Mongolian: Тэрхийн Цагаан нуур) covers the picturesque Terkhiin Tsagaan Lake and the nearby Khorgo Mountain (a recently extinct volcano) in the north central Khangai Mountains in Arkhangai Province, Mongolia.

The marshes along the west end of the lake are an important breeding and staging area for birds.

[2] Khorgo Mountain is about 4 km east of the lake, in the Taryatu-Chulutu valley, a volcanic field.

[5] The fish in the lake are typical northern Eurasian species - cyprinids (Cyprinidae), pike and perch.

Birds breeding in the marshes along the lake's edge include Bar-headed goose (Anser indicus), Ruddy shelduck (Tadorna ferruginea), and Red-breasted merganser (Mergus serrator).