Kōshin'etsu region
Kōshin'etsu (甲信越) is a subregion of the Chūbu region in Japan consisting of Yamanashi, Nagano, and Niigata prefectures. The name Kōshin'etsu is a composite formed from the names of old provinces which are adjacent to each other — Kai (now Yamanashi), Shinano (now Nagano) and Echigo (now Niigata).