In 1980, he helped lead a reconnaissance expedition to Mount Kongur, a remote, unclimbed mountain in China more than 25,000 feet high.
Until then it was the world's second highest unclimbed mountain after Gangkhar Puensum.
The former second highest unclimbed mountain, Saser Kangri II East (7,513 m ; Prom.
If it is in fact unclimbed, it is one of the most prominent unclimbed mountains in the world (see highest unclimbed mountain).
Gasherbrum V is one of the highest unclimbed mountains.
The highest unclimbed mountain in a particular region or in the world is often a matter of controversy.
The mountain most widely claimed to be the highest unclimbed mountain in the world in terms of elevation seems to be Gangkhar Puensum, 7570 m (24,836 feet).
It is also doubtful which is the highest unclimbed non-prohibited mountain.
It is similarly troublesome to determine the most prominent unclimbed mountain.
He made the first ascent of 114 previously unclimbed mountains throughout the Andes, Alps and Himalayas.
