大東群島
Being separated for more than 300 km from Ryukyu Islands, the nearest landmass, a unique and isolated ecosystem holding endemic species was established on Daitō Islands which doesn't include habu vipers naturally unlike many of Ryukyu Islands. Lack of snakes caused introduced and invasive toads to flourish and run rampant. Three main islands of Kita, Minami, and Oki were originally covered by virgin forests, however human activities including military exercise severely damaged and resulted in disappearing of forests and extinction of endemic species most notably on Okidaitōjima. Aside from eels, any fresh water fish and amphibians had not been recorded in pre-exploration periods. Entire archipelago excluding Okidaitōjima and smaller islands is listed as a Wildlife Protection Areas in Japan extending for 4,251 hectare with a special protection zone of 234 hectare.