The Darkhad depression is a large valley surrounded by Ulaan Taiga and Khoridol Saridag mountain range in the territory of northwest of Khuvsgul province, Mongolia.

The Khoridol Saridag is a 90 km-long mountain range  between Khuvsgul Lake and the Darkhad valley. The highest peak is Delgerkhaan Uul (3093m).
The Darkhad depression covers over 4000 sq km lying at an altitude of 1600m above sea level.
The valley is rich in lakes and rivers, the biggest of which are Dood Tsagaan Lake "lower white lake" and Shishged River, respectively. The area is famous for its natural beauty, but relatively remote and inaccessible even by Mongolian standards.

The Darkhad valley is divided into the Ulaan-Uul, Renchinlkhumbe, and Tsagaannuur sums. Inhabitants are mainly Darkhad (whom the valley's name derives from), and also some Tsaatan.

The Darkhad tribe is famous for its shaman practice and reindeer herders.