Known as the Dark Blue Pearl, Lake Khuvsgul is Mongolia's largest and deepest lake. In the northernmost aimag, its outlet is the largest tributary to Siberia's Lake Baigali (Baikal).
At 1,645m above sea level, it is frozen from January until April or May, after which a ferry runs between Khatgal and Khankh, the northern and southern towns within the boundaries of the National Park.
Here, shamanism survives as a religion among the Darkhads, and the Tsaatan rear reindeer. Tourists can trace the lake shores by horse, foot or on ship Sukhbaatar.
Fishing is allowed with a $3 licence for the abundant taimen, Siberian whitefish and grayling, lenok, umber, Baigali omul and river perch.
Lake Khuvsgul is an important migration route for birds from Siberia, haven for birdwatchers.The Dayan Deerhiin cave has ancient wall paintings.