A spring that has been passed down since the Sengoku period and is one of Japan's Top 100 Famous Waters.

This spring area, located at the southern foot of the Yatsugatake Mountains, is blessed with abundant, clear water and the wisdom of the people who have lived their lives using water. It is said that during the Sengoku period, Takeda Shingen erected a triangular stone pillar at the water distribution basin at the spring's outlet to fairly distribute water to three villages downstream, and this mechanism can still be seen today.
The water temperature remains stable at approximately 10 degrees Celsius throughout the year, and the sight of the pure water gushing out at a rate of about 8,500 tons per day is truly impressive. In 1985, it was selected as one of Japan's 100 Best Waters by the Ministry of the Environment as part of the "Yatsugatake Southern Foothills Plateau Spring Water Group." The surrounding area has been developed into a park, with walking paths surrounded by trees and observation spaces, where visitors can spend a relaxing time while experiencing both nature and history. At the adjacent "Sanbuichi Spring Water Museum," you can learn about the mechanisms of spring water in the southern foothills of Yatsugatake, water quality, and the history of the region.

292-1 Koarama, Nagasaka-cho, Hokuto City, Yamanashi Prefecture 408-0031
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・10-minute walk from Kai-Koizumi Station on the JR Koumi Line
・Approximately 15 minutes by car from Nagasaka IC on the Chuo Expressway / Approximately 15 minutes by car from Kobuchizawa IC