This mountain is formed with Granite.[5] Before 1959 nine kinds of butterfly on high mountains can be seen around the mountain.[6][7]Colias erate and others can be seen now. The shape of the remaining snow of this mountain had decided the time when it farmed. The shape was called Jōnen-Bō (常念坊, Jōnen-Bō).
History
Summer 1894: Englishman Walter Weston became the first man to climb on the top.[5][8]
Summer 1906: Usui Kojima became the first Japanese man to climb on the top.[3]
July 27, 1919: Mountain hut of Jōnen Hut (常念小屋, Jōnen-goya) was opened.[9]
1922: Kyūya Fukada stayed at the Jōnen Hut, and climbed this mountain.[3]
June 1931: The double accident of the climbing mountain party and the rescue team occurred.[9]
December 4, 1934: This area was specified to the Chūbu-Sangaku National Park.[4]
Jōnen Hut (常念小屋) - On the pass of Jōnen Pass (常念乗越, Jōnen-Nokkoshi) between Mount Jōnen and Mount Yokotooshi. It is one of the oldest hut in Japan.
Mount Chō Hut (蝶ヶ岳ヒュッテ) - Near the top of Mount Chō.
Yokoo Mountain Cottage (横尾山荘) - In Yokoo most in the north of Kamikochi.
Daiten Cottage (大天荘) - Near the top of Mount Otensyo.
Geography
Nearby Mountains
It is on the sub ridge line of Jōnen Mountains in the southeast part of the Hida Mountains. There is a small peak of Mount Mae-Jōnen in the southeast by east.[13]
^Walter Weston (2005) [1896]. 日本アルプスの登山と探検 [Mountaineering and exploration in Japanese alps] (in Japanese). Translated by Iwanami Shoten (new ed.). ISBN4-00-334741-2.