Shamanism holds that there art deities in mountains and rivers, and that these are eternal spirits. Shamans worship the spirits of the deceased, renowned shamans and those who have died accidentally. These are called “ongon”, ancestral spirits, and their portraits are located in special places, and are worshipped and given offer¬ings of food and drink.

Illness suffering and natural disaster were seen as caused by the anger of local deities. In such events, the people of the locality erected an “ovoo” (a pile of stones), and offered the choicest parts of their food to the ovoo while shamans performed invocations.

In the past every Khoshuun( former administrative units) had mountains and ovoos which were worshipped in locally significant celebrations. From the earliest times, the mountains of Khentii- Khan (KhentiiAimag), Bogd – Khaan (Ulaanbaatar), Otgontenger (ZavkhanAimag) and Altai Range and other large mountains were wor shipped.

Tsetsee – Gun, the top of Bogd – Khaan Mountain and 2257 m above sea level, had a sentry to protect it as holy sanctuary. Holy mountains had a special sutra which, was dedicated to them. The same went for entire mountain ranges like Khentii, Khangai and Altai, together with their branch mountains. Offerings and worship that took place in these holy mountains also served as a protection of nature.