Gangkhar Puensum is the highest mountain in Bhutan, and at 7,570 meters, it is the 40th highest peak in the world. As surprising as it may sound, Gangkhar Puensum still remains unclimbed, especially when most peaks in the Himalaya have already been scaled decades ago.
Gangkhar Puensum lies on the border of Bhutan and Tibet, although the exact boundary line is disputed. Chinese maps put the peak squarely on the border whereas other sources put it wholly in Bhutan.
When the mountain was first mapped and surveyed in 1922, maps of the region were shockingly inaccurate. Until very recently, maps of the region showed the mountain at different locations and marked with different heights.
In fact, one of the first team to attempt the summit was unable to find the mountain at all.