Ultras, which are mountain bases with a topographic prominence of 1,500 metres (4,900 ft) or more, are found in Japan.
An ultra-prominent peak, or Ultra for short, is a mountain summit with a topographic prominence of 1,500 metres (4,900 ft) or more; it is also called a P1500. There are approximately 1,524 such peaks on Earth. Currently, 1,515 Ultras have been identified above sea level: 637 in Asia, 353 in North America, 209 in South America, 119 in Europe (including the Caucasus), 84 in Africa, 69 in Australasia and 39 in Antarctica. List of Ultras in Japan (21) 
