The Kōshū Kaidō (甲州街道) was one of the five routes or major highways of the Edo period.
It was built to connect Edo (modern-day Tokyo) with Kai Province in modern-day Yamanashi Prefecture, Japan.
The route continues from there to connect with the Nakasendō's Shimosuwa-shuku in Nagano Prefecture.
[1] Many feudal lords from Shinano Province made use of the road during sankin-kōtai, including those from the Takatō, Suwa and Iida domains.
There are 44 post stations along the Kōshū Kaidō.