The area of salt marshes is 600 hectares and its volume is 55 km. Khoja Mumin consists mainly of salt rock, known in mineralogy as halite (salt). The thickness of salt reaches 200-240 m. According to experts, the salt reserves of Khoja Mumin are about 40-50 billion. The depth of the salt rock is still unknown.The famous Venetian traveller Marco Polo (13th century), who came here, wrote: "As long as the world exists, the salt of this mountain is enough for the population of the globe." These were the first observations. But serious scientific research began during the Soviet era. This giant lump consists almost entirely of salt, only the top and some of the slopes are covered with a thin layer of soil. The cap of this salt mushroom has an area of 40 square kilometers! A small town can be easily located on the top of the salt mountain consists of pink and green-blue salt, which plays with all the colors of the rainbow on the steep slopes, the height of which reaches 150-200 meters.
Khoja Mumin is also famous for its musical caves; passages washed out by underground rivers and streams form such a unique structure of a natural organ that visitors can hear polyphonic and multi- tone musical works. Geologists call these formations "salt domes".