The sand dunes of Khongor are located in Sevrei, Umnu-Gobi province. The 185km long sand dunes extend on the north side of Sevrei and Zoolon mountains. Known as Duut or the Singing dunes, the highest peak of the dunes reach up to 240m.

The river Khongor flows on the north side of the dunes. There are some beautiful pure water springs flowing from underneath the sand such as Seruun Bulag and Orgikhin Bulag.