库苏古尔省
The ongon is particularly important in black shamanism: the main function of the "khar talynkh" or black shaman is to bring people into contact with the ongon, whose spirit they call up "while drumming in a trance". In late-nineteenth century Mongolia, according to Otgony Purev, yellow shamanism revered ongon as well, and every three years yellow shamans gathered in Dayan Deerh monastery in Khövsgöl Province to "renew" these ancestral spirits.