|Time zone||UTC + 8 (UTC+8)|
Tsagaan-Üür (Mongolian: Цагаан-Үүр) is a sum of Khövsgöl aimag. The area is 8,730 km², of which only 1,140 km² are pasture. In 2000, Tsagaan-Üür had a population of 2,421 people, including Khalkha, Uriankhai, and Buriad. The sum center, officially named Bulgan (Mongolian: Булган), is located on the banks of the Üür River, 173 km north-east of Mörön and 844 km from Ulaanbaatar.
The Tsagaan-Üür sum was founded, together with the whole Khövsgöl aimag, in 1931. In 1933, it had 2,400 inhabitants in 690 households, and about 22,000 head of livestock. The local negdel, first named Uilgan and later Tsog, was founded in 1939.
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M. Nyamaa, Khövsgöl aimgiin lavlakh toli, Ulaanbaatar 2001, p. 195f
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