Burkhan Khaldun means the God Mountain and is also called Khentii Khan (The King of the Khentii Mountain range).: It is one of the Khentii Mountains in the Khentii Province of northeastern Mongolia. It is the highest mountain of the region, rising to an elevation of , and is crescent-shaped. It is the source of several rivers: the Onon and Kherlen rivers flow into the Amur, which has its outfall in the Pacific Ocean; and the rivers Tuul, Kharaa and Yeruu flow northwards to join the Selenge, which empties into the Arctic Ocean. It is in a complex ecosystem with unique biodiversity which is defined as a transition zone from Siberian permafrost land forms to great steppe.: