The Nanpo Shoto is a chain of Japanese islands extending from the Izu Peninsula west of Tokyo Bay southward for about 750 miles (1200 km), to within 300 miles (500 km) of the Mariana Islands.
The Nanpo Shoto consists of three major groups of islands: the Izu Shoto; the Ogasawara Gunto, also known as the Bonin Islands; and the Kazan Retto, also known as the Volcano Islands. Among the latter group of islands lies Iōjima or Iwo Jima, located about 670 miles south of Tokyo, 700 miles north of Guam and nearly halfway between Tokyo and Saipan.
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