The greatest concern for the inhabitants of these islands, located in the Taiwan Straits off the midwestern Taiwan coast, is the provision of water supplies. With an area of 64.26 square kilometers, Penghu has an average rainfall of only 1,000 mm. a year, which is not sufficient.
澎湖位於台灣海峽東南部，面積有六四．二六平方公里，年雨量約一千公釐，降雨量不多，加上地勢平坦，全島最高處為海拔五十公尺，即使在雨季亦無法貯存足夠的用水。