Ulaan-Uul (Mongolian: Улаан-Уул = red mountain) is a sum of Khövsgöl aimag.

In 2004, there were about 72,000 heads of livestock, among them 23,000 goats, 24,000 sheep, 17,000 cattle, yaks, and khainags, 7,000 horses, and 216 camels.

[1] Ulaan-Uul sum covers the southern part of the Darkhad valley, a basin that is considered remote even by Mongolian standards.

The locals practice a form of shamanism strongly influenced by Buddhism, and the Öliin davaa pass (literally "bald pass") that enters the Darkhad valley from the south has a group of 13 ovoos constructed of standing sticks in tepee form that are regularly used for festivals and naadam.

[2] Both the Delgerkhaan uul and parts of the Ulaan Taiga National Park are located in this sum.