Guchin-Us (Mongolian: Гучин-Ус, meaning is Thirty water) is a sum (district) of Övörkhangai Province in southern Mongolia.

[1] The town of Arguut, 104 km from the Province capital Arvaikheer, is the administrative center of the soum, but mostly it is called "Guchin Us" as well.

[2] There are several prehistoric rock paintings and buddhist inscriptions in the north-east of the town, close to the unpaved road to Arvaikheer.

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