Qimei Township is located at the southernmost tip of the Penghu archipelago. In the early Qing dynasty it was called “Nan Yu” or “Nan Da Yu,” but because most people believed its area was the largest among the offshore islands south of Penghu, it was renamed “Da Yu” again during the late Qing and early Republic periods. During Japanese rule, “Da Yu” was a “mura” under the jurisdiction of “Wang'an Village.” It was not separated from Wang'an until August of the 33rd year of the Republic (1944), becoming “Da Yu Village.” On December 11 of the 34th year (1945), it was renamed “Da Yu Township.” In the 38th year (1949), the county magistrate Liu Yanf (the fourth magistrate of Penghu) honored the virtuous and moving deeds of Qimei’s people, convened local officials to discuss renaming the area, and submitted the proposal to the provincial government for approval. The original “Da Yu Township” was therefore renamed “Qimei Township” as a permanent memorial. Today, Qimei Township administers six villages: Donghu, Xihu, Zhonghe, Pinghe, Haifeng, and Nanguang.
Qimei Island is located at 119°40′E, 23°16′N, about 29 nautical miles (36 km) east of Magong, 48 nautical miles east of Tainan, and 58 nautical miles south of Kaohsiung. The total area of the island is approximately 6.99 square kilometers, with a perimeter of 14.40 kilometers. It is a rectangular, steep island and the fifth-largest island in the Penghu archipelago.