Bayandalai 

Bayandalai  is a sum (district) of Umnugovi Province in southern Mongolia. In 1931, Khongor Ovoo was moved to the Dalai area by its single home, Bayan Tuhum. Since 1935, the second Khongor Ovoo sum was renamed as Bayandalai. Bayandalai population and ethnography are comprised of members of the Khalkh and central Khalkha.

The sum is 1075,1 square kilometers square and is bordered with Noyon and Sevrei and sums in the south-east of China. It is located in the west of the province center and is 670 kilometers from Ulaanbaatar and 86 km from the province center .The sum has 2316 inhabitants.