The Ogasawara Islands are oceanic islands comprised of about 30 islands of various sizes, including Mukojima Islands, Chichijima Islands, Hahajima Islands, Iwo Islands, Okinotori Island, Minamitorishima and Nishinoshima from north to south. As they are in the ocean separated from Tokyo by about one thousand kilometers, a lot of uniquely evolved, endemic plants and animals are found on the islands.