Kikaijima is a subtropical island of uplifted coral reefs located in the southwestern part (Ryukyu archipelago) of Japan. Along with several other islands nearby, it comprises Amami Islands– a group of islands that belongs to Kagoshima Prefecture. Compared to the other islands across the globe, Kikaijima is unique in several aspects. First, it is situated on the border of the Pacific Ocean and the East China Sea and is therefore greatly influenced by monsoons, typhoons, and other meteorological phenomena on a regular basis. Second, it is made up of fossils of ancient coral reefs that date back as far as 100,000 years ago. It now boasts extremely rare coral reef terraces created by changes in the sea level and upward crustal movements. These aspects make the island an optimal place for researches on the marine environment and climate change on a global scale. The uplifted coral reefs of Kikaijima are the sources of the detailed records of the global climate change. Indeed, much international research on coral reefs has took place on this island.