Map of the Izu Islands The Izu Islands (伊豆諸島, Izu-shotō) are a group of volcanic islands stretching south and east from the Izu Peninsula of Honshū, Japan. [1] Administratively, they form two towns and six villages; all part of Tokyo Prefecture. The largest is Izu Ōshima, usually called simply Ōshima. Although usually called the "Seven Islands of Izu" (伊豆七島 in Japanese ...