Penghu County is located in the Taiwan Straits, surrounded by ocean. The large number of islands in the archipelago scatter like separated pearls from a necklace. The Penghu archipelago consists of many islands. At low tides, there are as many as one hundred islands located between 23¡C47' to 23¡C9' north latitude and 119¡C18' to 119 east longitude. At the easternmost tip lies the Women Island; the westernmost tip Flower Island; the southernmost tip Chimei island; and the northernmost Muto Island. The land area totals 126.86 square kilometers. The Makung Island is the largest island in the archipelago, followed by Hsiyu, Baisha, Wanan and Chimei. The geographical environment is affected by the three following factors, which contribute to the formation of different natural environment and ecology.