Munku-Sardyk is the highest point of the Eastern Sayan mountains. Its height reaches 3,491 meters. "Munku" means "Eternal" and "Sardyk" ("Sardag") means "woodless mountain" in Buryat language. Sometimes "Sagan" is added to the name and in this case the name means "Always white woodless mountain". The Munku-Sardyk massif is a part of the Big Sayan ridge, however the area of rocky ridges with woodless mountains is not big here. Its southern part belongs to Mongolia, and to the north of Munku-Sardyk there is a plateau where the source of Oka, Irkut and Kitoy rivers is located.