Japanese islands in the Pacific, N of the Marianas and 1,300 km/800 mi E of the Ryukyu islands. They were under US control 1945-68. The Bonin Islands (Japanese Ogasawara Gunto) number 27 (in 3 groups), the largest being Chichijima: area 104 sq km/40 sq mi, population (1970) 300. The Volcano Islands (Japanese Kazan Retto) number 3, including Iwo Jima, scene of some of the fiercest fighting of World War II; total area 28 sq km/11 sq mi.