Doi Nang Non from where the "sleeping lady" can best be observed. Local tour guides joke that Doi Nang Non would be "the highest mountain in the world", if only the supposed lady would get up and stand on her feet. Doi Nang Non Doi Nang Non (, ; 'Mountain of the Sleeping Lady') is a mountain range in the Thai highlands in Chiang Rai Province, Thailand. It is a karstic formation with numerous waterfalls and caves rising at the southern end of the Daen Lao Range. Part of its area is managed as the Tham Luang–Khun Nam Nang Non Forest Park ().
Highest unclimbed mountain Siple Island off the coast of Antarctica, have no record of successful ascents, but the unclimbed status of each of these peaks is difficult to confirm. The following peaks, with a minimum prominence of , were thought to be unclimbed as of August 2018. Highest unclimbed mountain An unclimbed mountain is a mountain peak that has yet to be climbed to the top. Determining which unclimbed peak is highest is often a matter of controversy. In some parts of the world, surveying and mapping are still unreliable, and there are no comprehensive records of the routes of explorers, mountaineers and