The Onon Hot Spring is based on the upper portion of River Onon in Mongolia. It is around twenty four miles from the south of the border of Russia. There are at least fourteen mineral springs over here. Some of them have boiling water. It also includes many bathhouses too.The two major springs which are covered with bathhouses are namely the Ikh Tsenkher and the Baga Tsenkher. They mean Big Blue and Little Blue respectively. These names were given by Zanabazar.
These springs are popular for healing diseases and specially treating the ailments of the lower part of the body. The knees are specially treated by the mud packs which are taken from near the spring. The mud pack is also effective for liver and kidney problems, sore muscles, lower back pain and various other skin diseases.