The is a Japanese geographical term. It means both an ancient division of the country and the main road running through it. Saikaido was one of the main circuits of the Gokishichidà  system, which was originally established during the Asuka period.
This name identified the geographic region of Kyà «shà « and the islands of Tsushima and Iki. It consisted of nine ancient provinces and two islands. The provinces included Chikuzen, Chikugo, Buzen, Bungo, Hizen, Higo, Hyà «ga, Satsuma and à Âsumi.