Tolbo (, Stain) is a sum (district) of Bayan-Ölgii Province in western Mongolia. It is primarily inhabited by ethnic Kazakhs. As of 2021 it had a population of 8,372 people.
A large saline lake, Tolbo Lake, is located in the district, just north of the sum center. The lake was the site of the Battle of Tolbo Lake (1921) during the Russian Civil War where Bolsheviks and Mongolian allies defeated an army of White Russians.
Administrative divisions The district is divided into six bags, which are: Buraat Duruu Nuur Khongor Ulun Khosh Khukh Tolgoi Tolbo Nuur
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