Gangkhar Puensum is the highest mountain in Bhutan and the highest unclimbed mountain in the world, with an elevation of 7,570 metres and a prominence of 2,995 metres. In Dzongkha language, its name means "White Peak of the Three Spiritual Brothers". Gangkhar Puensum lies on the border between Bhutan and Tibet. After Bhutan was opened for mountaineering in 1983, there were four expeditions that resulted in failed summit attempts in 1985 and 1986.