Ultra (hill)
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An Ultra, or ultra prominence is a mountain with a relative height of at least 1,500 metres (4,921 ft), regardless of absolute height or other merit.
Currently, 1,524 Ultras have been identified worldwide: 654 in Asia, 357 in North America, 209 in South America, 119 in Europe (including the Caucasus), 84 in Africa, 54 in Australasia and 39 in Antarctica. The list was compiled by Aaron Maizlish and published on peaklist.org.
Many of the world's largest mountains are Ultras, including Mount Everest, K2, Mont Blanc, Mount Olympus and Kilimanjaro. On the other hand, many large and famous mountains such as the Eiger, the Matterhorn or Ben Nevis are not Ultras because they do not have sufficient relative height. 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 and Jan Mayen and Spitsbergen and 136 in High Asia. A number of Ultras have yet to be climbed with Mount Miller and (possibly) Mount Siple, both in Antarctica, heading the list as the most prominence unclimbed mountains in the world. In British Columbia, some of the mountains listed don't even have generally-recognised names.