Location: 950 km east of Ulaanbaatar in the Khalkh soum of Dornod province.
Features: The biggest lake in the eastern region of Mongolia is Buir Lake. The lake is located 311 km distant from the east of Choibalsan city and is the fresh water lake where the most water birds gather in Mongolia, being 21 kilometers wide, 40 kilometers long and covering 615 square kilometers.