Yatsugatake Mountains, viewed from Minamimaki, Nagano.
|Elevation||2,899 m (9,511 ft)|
|Length||30 km (19 mi) North-South|
|Etymology||Mountain with eight peaks|
|States||Nagano Prefecture and Yamanashi Prefecture|
|Age of rock||Quaternary|
|Type of rock||Volcanic|
The mountain range consists of two volcanic groups, Northern Yatsugatake Volcanic Group and Southern Yatsugatake Volcanic Group. The two volcanic groups of Yatsugatake, North and South, have different characteristics. The South Yatsugatake mountains are steep and are more alpine in nature. The mountains belonging to North Yatsugatake mountains are gentler and lower than the South Yatsugatake mountains.
These mountains consist of older eroded complex volcanoes, which were made by repeated volcanic eruptions over many thousands years. The last eruption was estimated from 600 to 800 years ago at Mount Kitayoko of North Yatsugatake Mountains. This is the only remaining active volcano. The other volcanoes are extinct.
According to legend, Yatsugatake was once higher than Mount Fuji, but Konohanasakuya-hime, the goddess of Mount Fuji, tore it down out of jealousy, leaving the collection of peaks that exists today. Paul Hunt muses that this might not be far from the truth considering that Yatsugatake is older than Fuji and as Fuji rose in prominence Yatsugatake wore away.
Deciduous forests reach up 800-1700m above sea level. Above this zone is the subalpine zone reaching up to 2500m. Siberian dwarf pine inhabits this subalpine zone. On one part of Mount Nishi under 1700m grows a rare form of spruce, Picea koyamae. Rock Ptarmigan (Lagopus muta) are also native to these mountains, but are under threat due to loss of the Siberian dwarf pine habitat and also due to expansion of the range of the red fox. Humans have enabled the expansion of the red fox by leaving trash behind in the mountains. Also growing in the subalpine zone are Abies veitchii and Abies mariesii.
- Hunt, Paul (1988). "14. Eight Peaks: Yatsu-ga-take 八ヶ岳". Hiking in Japan: An Adventurer's Guide to the Mountain Trails (First ed.). Tokyo: Kodansha International Ltd. pp. 111–112. ISBN 0-87011-893-5.
- 八ヶ岳中信高原国定公園. Japan Integrated Biodiversity Information System (in Japanese). Ministry of the Environment, Government of Japan. Retrieved 2008-09-05.
- "KITA YATSU-GA-TAKE (TATESHINA-YAMA, YOKO-DAKE etc.)". Quaternary Volcanoes of Japan. Geological Survey of Japan, AIST. 2006. Retrieved 2008-08-21.
|Wikimedia Commons has media related to Yatsugatake Mountains.|
- Kita Yatsugatake (Northern Yatsugatake) - Geological Survey of Japan
- Minami Yatsugatake (Southern Yatsugatake) - Geological Survey of Japan