Tsagaannuur (Mongolian: Цагааннуур, white lake) is a sum of Khövsgöl aimag.

The sum center, officially named Gurvansaikhan (Mongolian: Гурвансайхан), is located at the shore of Dood Tsagaan Lake.

In 2004, there were about 8,000 heads of livestock, among them 2,400 goats, 2,100 sheep, 2,300 cattle and yaks, 1,100 horses, 6 camels, and 632 reindeer.

According to the statistics provided by the Tsagaan Nuur Sum government on November 13, 2014, in a general assembly with residents of the sum's Xarmai district, the total amount of domestic reindeer in both nearby West Taiga and in East Taiga is 1511.

[2] This sum covers the north-western part of the Darkhad valley, a basin that is considered remote even by Mongolian standards.