Yero'o' sum (Selenge aimag)
Yero'o' sum is located in Selenge aimag (http://www.selenge.mn/) in Northern Mongolia, 520 km to the North of Ulaanbaatar within the xangai (forested steppe) ecoregion. Selenge is little more than a third the size of Dornogobi, but has close to double the population; its population density is 2.19 persons/km². Yero'o' was formerly a state farm in which fine-wool sheep were specially bred to produce luxury grade wool in the 1970s and 1980s; since its privatization herders have experienced increasing transection of grazing areas by large-scale agriculture and mining operations. Despite local authorities' efforts to limit pastoralism in this sum, the district experiences continuing inbound migration of pastoralists from the Gobi and Altai regions.

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