Gangkhar Puensum (Dzongkha: གངས་དཀར་སྤུན་གསུམ་ Kangkar Punsum, alternatively, Gangkar Punsum or Gankar Punzum) is the highest mountain in Bhutan and the highest unclimbed mountain in the world, with an elevation of 7,570 metres (24,836 ft) and a prominence of 2,995 metres (9,826 ft). Its name means "White Peak of the Three Spiritual Brothers". It lies on the border with Tibet. After Bhutan was opened for mountaineering in 1983 there were four expeditions that resulted in failed summit attempts in 1985 and 1986. In 1999, a Japanese expedition successfully climbed Liankang Kangri, a 7,535 metres (24,721 ft) subsidiary peak (not an independent mountain), separated from the main peak by a 2 kilometres (1.2 mi) long ridge to the north-northwest.