Matsu is located to the North-west of Taiwan and offshore of China, facing China’s Min River estuary, is administrated as Lanjiang county of Taiwan. Matsu is divided into four townships with 5 major islets and numerous inhabited islets of ecological significance. From north to south, 5 islets respectively, are Dongyin, Beigan, Nangan, Xiju and Dongju. These islets were separated from Euro-Asian continent geographically ten thousand years ago or at the end of the last Ice age when the sea level rose about 120 meters.