کوه پویان ایران

Gangkhar Puensum: World’s Highest Unclimbed Mountain

Elevation: 24,836 feet (7,570 meters)
Location: Bhutan-Tibet border. Central Asia.
First Ascent: Unclimbed as of 2009, but had four attempts until the mountain was closed to climbing in 1994.

Gangkhar Puensum, the 40th highest mountain in the world, is also the highest unclimbed mountain left for mountaineers.

منبع: http://climbing.about.com/od/mountainclimbing/a/GangkharPuensu.htm