Bayannuur (Mongolian: Баяннуур, Mongolian: rich lake) is a sum (district) of the Bayan-Ölgii Aimag (province) in Mongolia.

It is located to the very east of the aimag capital Ölgii and it has a border with the Uvs Aimag.

Like in Bayan-Ölgii's other sums, Bayannuur is primarily inhabited by ethnic Kazakhs.

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