August 8, 2022

Yatsugatake (also written as Yatsugatake or Yatsugatake) is a volcano that stretches north and south from Nagano Prefecture to Yamanashi Prefecture to the east of Lake Suwa. One of Japan's 100 Famous Mountains. "Yatsugatake" is not a name that refers to a specific peak, but is a general term for mountains that extend over both Yamanashi and Nagano prefectures, but the range is "only the so-called Minami Yatsugatake south of Natsuzawa Pass", "Minami Yatsugatake and Kita Yatsugatake". There are various definitions such as the area of ​​(excluding Mt. Tateshina) and the entire Yatsugatake mountain range including Mt. Tateshina. Yatsugatake in Japan's 100 Famous Mountains refers only to Minami Yatsugatake.


Yatsugatake is a series of volcanoes consisting of about 20 peaks in a distance of about 25 km north to south from Mt. Tateshina (2,530 m above sea level) in the north to Mt. In addition, volcanic ejecta can be seen in the surrounding area of ​​60 km north to south and 25 km east to west. The highest peak is Akadake (altitude 2,899m). Yatsugatake, which is long in the north-south direction, is divided into North Yatsugatake and South Yatsugatake with the Natsuzawa Pass as the boundary, showing different mountains. The mountains of Kita Yatsugatake have many relatively gentle peaks at the summit, and lava flows and lava domes are well preserved, and the volcanic foot that has been dissected into folds spreads out at the foot of the mountain. In Kita Yatsugatake, forest belts continue to near the mountain ridges and lakes and marshes are scattered. On the other hand, the mountains of Minami Yatsugatake have a series of sheer peaks due to erosion at the summit, and a huge alluvial fan at the foot of the mountain. Minami Yatsugatake has some of Japan's premier rock climbing rocky areas that make use of the steep topography, and the rocky ridges that are known for ice climbing in the winter are the center of the mountain. Most of these areas are designated as the Yatsugatake Chushin Kogen Quasi-National Park. The area is also a volcanic area, so there are many hot springs. Yatsugatake as a volcano has no reliable eruption record in historical times. However, there is a hypothesis that the disaster of 888 (Ninwa 4) in the ancient documents was volcanic activity related to the occurrence of Otsukigawa debris flow caused by the collapse of Mt. Tengu. It is said that the cause of the collapse of the volcano is both an eruption and an earthquake, but no evidence of an earthquake or an eruption has been found to this day, making it a big mystery. Also, although there is no historical record, there is a geologically new lava eruption at Mt. Kitayokodake, and recent research suggests that the eruption occurred 600 to 800 years ago. Highland vegetables are cultivated up to about 1,200m of Mt. Yatsugatake, and pastures spread out, broadleaf forests, coniferous forests, mixed trees, flower gardens, and wild rocky ridges. The expansive foothills include the Kiyosato Plateau and Nobeyama Plateau on the east, and the Fujimi Plateau and Tateshina Plateau on the west. there is Its base straddles Yamanashi Prefecture and Nagano Prefecture, and extends to the Suwa Basin, Saku Basin, and Kofu Basin. Because underground water springs up at the foot of the mountain, ruins from the Jomon period are densely distributed, especially in the southwestern foothills. On the Nagano Prefecture side, there are the Idojiri Ruins and the Togariishi Ruins. On the Yamanashi Prefecture side, there are the Kandori Ruins (Hokuto City, formerly Akeno Village, Kitakoma District) and the Aoki Ruins from the early Jomon period, as well as the Tenjin Ruins (formerly Oizumi Village) from the Moriso Shiki period. In the mid-Jomon period, base settlements moved from the foothills to the Kofu Basin, but there is also the Uenohara Ruins at the foot of Mt. Although the number of ruins decreased throughout the late period, the Kinsei Ruins (former Oizumi Village) is a complex of ruins of settlements and ritual facilities, and stone arrangement remains that reveal the spiritual culture of the Jomon period can be seen. In addition, the origin of ``Yatsugatake'' is the same as ``Yaoyorozu,'' and it is said that ``8'' means ``a lot'' because of the appearance of many mountains.