甲斐国
The area around Lake Kawaguchi has been inhabited since at least the Jōmon period. It was on the road connecting Kai Province with Suruga Province, and is mentioned in Heian period records, which also document an eruption of Mount Fuji in 864 AD. During the Edo period, all of Kai Province was "tenryō" territory under direct control of the Tokugawa shogunate. During the cadastral reform of the early Meiji period on July 1, 1889, the area came under the jurisdiction of Minamitsuru District, Yamanashi Prefecture.