Bayantu'men (Mongolian: Баянтүмэн, Rich tumen), also Tsagaanders (Mongolian: Цагаандэрс) is a sum (district) of Dornod Province in eastern Mongolia.

Name "Bayantu'men" was in use for Choibalsan city (before 1941), the railway station and mine in the NE outskirts of Choibalsan city have name of Bayantu'men also.

[1] The district is separated into the east part and west part, in which the Choibalsan City is located in between separating them.

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