The Kazan Rettō or Iō Rettō are a group of three Japanese-governed islands in Micronesia. They lie south of the Ogasawara Islands and belong to the municipality of Ogasawara, Tokyo, Tokyo, Japan. The islands are all active lying atop the Izu–Bonin–Mariana Arc that stretches south to the Marianas. They have an area of , and a population of 380. The island of Iwo Jima in the Volcano Islands lies about southeast of Miyazaki.
There is a Japan Self-Defense Forces air base on Iwo Jima with a staff of 380. It is located in the village of Minami. Other than that, the islands are uninhabited.
The islands were uninhabited in 1889 when Japanese settlers settled the two northern islands from the Izu Islands. They were annexed by Japan in 1891. However, archeological evidence has revealed that islands of the greater Bonin Islands were prehistorically inhabited by an unknown Micronesian people. 小笠原・火山(硫黄)列島の歴史
The population was about 1,100 in 1939, distributed among five settlements: Higashi, Minami, Nishi, Kita, and Motoyama (meaning "East", "South", "West", "North", and "Mountain of Origin", or central mountain) on Iwo Jima; and two settlements on Kita Iwo Jima: Ishino-mura ("Ishino village"; Ishino is a surname) and Nishi-mura ("West village"). The municipal administration office was located in Higashi until 1940 when the municipality was integrated into the administration of Ogasawara, Tokyo.
Iwo Jima was the site of the Battle of Iwo Jima in World War II, and the island group came under the United States administration. The Volcano Islands were returned to Japanese rule in 1968.
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