Kai (甲斐市, Kai-shi) is a city located in Yamanashi Prefecture, Japan. As of 31 December 2021, the city had an estimated population of 73,626, and a population density of 1,100 persons per km². The total area of the city is 71.95 square kilometres (27.78 sq mi). Kai is located in central Yamanashi Prefecture, orientated north-south along the banks of the Fuji River. Per Japanese census data, the population of Kai more than tripled between 1960 and 2000 and has grown at a slower pace since. The area of present day Kai was part of ancient Kai Province and have numerous Jomon period ruins. During the Sengoku period, warlord Takeda Shingen built embankments on the Kamanashi River for flood control and to open up new rice lands. During the Edo period, all of Kai Province was tenryō territory under direct control of the Tokugawa shogunate. More information...
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