|
An ultra-prominent peak, or Ultra for short, is defined as a mountain summit with a topographic prominence of or more. There are approximately 1,515 such peaks on Earth.〔 Some are famous even to non-climbers, such as Mount Everest, Aconcagua, and Denali (the top three by prominence), while others are much more obscure. Some famous peaks, such as the Matterhorn and Eiger, are not Ultras because they are connected to higher mountains by high cols and therefore do not achieve enough topographic prominence. The term "Ultra" is due to earth scientist Stephen Fry, from his studies of the prominence of peaks in Washington in the 1980s. His original term was "ultra major mountain", referring to peaks with at least 5,000 ft (1,524 m) of prominence. ==Distribution== Currently, 1,515 Ultras have been identified worldwide: 637 in Asia, 355 in North America, 209 in South America, 119 in Europe (including the Caucasus), 84 in Africa, 69 in Australasia and 39 in Antarctica. Many of the world's largest or best-known mountains are Ultras, including Mount Everest, K2, Kilimanjaro, Mont Blanc, and Mount Olympus. On the other hand, many large and famous mountains such as the Eiger and the Matterhorn are not Ultras because they do not have sufficient prominence. Many Ultras lie in rarely visited and inhospitable parts of the world, including 39 in Greenland, the high points of the Arctic islands of Novaya Zemlya, Jan Mayen and Spitsbergen, and 136 in High Asia. In British Columbia, some of the mountains listed do not even have generally recognized names. A number of Ultras have yet to be climbed, with Sauyr Zhotasy, (possibly) Mount Siple, and Gangkar Puensum being the most likely candidates for the most prominent unclimbed mountain in the world.〔〔 (See footnotes 3 and 10.)〕 All of the Seven Summits are Ultras by virtue of the fact that they are the high points of large landmasses. Each has its key col at or near sea level, resulting in a prominence value almost equal to its elevation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ultra-prominent peak」の詳細全文を読む スポンサード リンク
|