Mount Jonen is one of the 100 Famous Japanese Mountains, reaching the height of 2,857 m. It
is situated in Japan's Hida Mountains in Nagano
Prefecture and in Chubu-Sangaku
National Park. The shape of the mountain looks like the triangle. It can be seen from Azumi
Basin. This mountain is formed with Granite. Before
1959 nine kinds of butterfly on high mountains can be seen around the mountain. Source
