What is the name of the highest unclimbed mountain in the world, located in Bhutan?

Gangkhar Puensum is widely recognized as the highest unclimbed mountain in the world. Rising to about 7,570 metres, it stands on or near the Bhutan–China border and is regarded as Bhutan’s highest mountain. Its Dzongkha name is commonly translated as “White Peak of the Three Spiritual Brothers.”

The mountain’s unclimbed status is not simply a result of technical difficulty. Bhutan opened parts of the country to mountaineering in the 1980s, and several expeditions attempted Gangkhar Puensum in 1985 and 1986. Bhutan then prohibited climbing peaks above 6,000 metres in 1994, partly out of respect for sacred mountains. Since 2003, mountaineering has been banned entirely in Bhutan.

A 1999 Japanese expedition climbed Liankang Kangri, also called Gangkhar Puensum North, from Tibet. That peak is a subsidiary summit separated from the main mountain and does not count as an ascent of Gangkhar Puensum itself. Everest, K2, and Annapurna are all higher-profile mountains, but each has been successfully climbed.