Shikoku is the smallest of the four main islands of Japan. It is 225 kilometres long and between 50 and 150 kilometres wide. It has a population of 3.5 million, the least of Japan's four main islands. It is south of Honshu and northeast of Kyushu. Shikoku's ancient names include Iyo-no-futana-shima (伊予之二名島), Iyo-shima (伊予島), and Futana-shima (二名島), and its current name refers to the four former provinces that make up the island: Awa, Tosa, Sanuki, and Iyo.