Petrified trees which have been considered as geological remains are found in 95 km in southwest of Mandakh soum in the middle of a small hill, named Suikhent, located in the west of Khurentsav, which is situated in the southeast of the soum. These petrified trees can show us that there was a forest in the area in ancient time.
According to the scientists, the land of the area was pushed downward by tectonic forces in early Jurassic Era and forest trees were disappeared under lake water and gradually, covered by mud flows and sediments as well as top of the petrified trees was raised and appeared on the ground.
The petrified trees have lived for 60-120 millions of years and the Russians named the tallest petrified tree as „Bolotni kapiras" or „ Marshy cypress". There are over 20 kinds of petrified trees and forest in the world and some occurs in South America, Australia, and South East Asia.
The Petrified Forest has spread in 500 m long and 80 m wide in 6 different areas of the country. The length of some petrified trees was registered as 4 m and diameter of its trunk was 76-189 cm. The recent remain of the petrified trees is about 2 m in length, 0,5-1,5 m In width and over 2 tons in its weight.
Therefore, broken pieces of petrified trees, which can be seen like giant crystals, often sparkling in the sunlight as if covered by glitter.
In 1946, Russian scientist E.A. Efremov wrote that he saw 6 pieces of a large petrified tree, which has 11 m in total length and 4 m in width when he was going in Choilon's mountain of Sainshand town. He also noticed that he saw a 4 m wide petrified tree trunk. In late 1970s, trunks, stouts and broken pieces of Suikhent petrified trees were naturally safely remained but in recent years, resources have been reduced sharply because of cross bordered illegal sales of the petrified pieces.
One interesting feature of the Suikhent petrified trees is we can see the roots,
branches, bark and even grow circles of the petrified trees.    
Following is a list of contaminating rep elements and related color hues: cobalt - Gol green/blue, chromium -green/blue, copper  - green/blue, iron oxides - red, brown, and  yellow, and manganese - pink/orange.
The petrified trees have been becoming  witnesses of an ancient geographical unique landscape not only in Mongolia but also In the world. Another petrified forest  can be seen in Tsagaantsav, 40 kilometers north of the Suikhent Petrified Forest.
temans of the Petrified trees
The Suikhent mountain belongs to Gobi region thus, we can see some i representatives of flora: saltwort and other Gobi plants, and fauna: wild horses, blacktailed gazelles, antelopes, wild sheep and some rodents such as different species of jerboas: Gobi, Siberian and long-eared jerboas.
4830 ha area of the Petrified Forest of Suikhent gained state protection as a Natural and Historical Monument in 1996 according to decree number 43 of Mongolian State Great Khural.

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