The Ogasawara Islands is the general term for 30 islands of various size scattered over the Pacific Ocean. Located to the south of the Izu Islands, they are made up of three groups of islands. The first group is the Ogasawara Archipelago consisting of Muko-jima, Chichi-jima and Haha-jima islands. The second group is made up of the Io Islands and three other islands. Nishi-no-shima, Minani-tori-shima, and Oki-no-shima islands belong to the third group. The whole area forms a part of Ogasawara National Park.
The islands were formed by the protrusions of an ancient underwater volcano, so flatlands are rare and there are many sheer cliffs along the coast. There is little change in temperature due to oceanic and subtropical climate, this area hardly ever receives snow or frost. Ogasawara Islands have always been remote, never being adjacent to a continent since they were formed, animals and plants have evolved in their own natural way there. There are more than 100 kinds of indigenous plants and over 14 kinds of animals that are native to the islands , all designated as protected species.
Chichi-jima Island is tthe main island and the entrance to this area – 1,000 kilometers south of downtown Tokyo in the Pacific Ocean, and it has a land area of about 24 square kilometers. Water-eroded high cliffs surround the island making the scenery even more magnificent, and the area is a popular spot for divers.