Khalkhgol (Mongolian: Халхгол, meaning Khalkha river) is a sum (district) of Dornod Province in eastern Mongolia.

The area of the sum is 28,093 km², with a population density of 0.11 people/km².

[2] In 2019, the redevelopment project was completed, which consists of the governor's office, cultural center, hospital, secondary school and its students dormitory, kindergarten and sport hall.

[3] It largest district in Mongolia by land area.

Most precipitation falls in the summer as rain, with some snow in autumn and spring.