The Liaowan Mountain of Houliao is the highest point in Baisha with the height of 52 meters above sea level. About 3 kilometers from western Liaowan Mountain, Tachiting Mountain located in Tungliang is the second highest mountain with a height above sea level of 31 meters. Four villages: Tingfeng Hsiajui, Chitou, Kangtzu, Chenhai, Chiangmei and three villages: Tungliang, Houliao, Watung on Baisha main islet are located along the west and east coast embarrassing the bay.
Because it is located in shallow sea of continental shelf, the water depth in nearby sea area is averagely less than 50 meters. Therefore, wave erosion platforms grow well around all islands, and there are broad coral reef shelves. Also because of this natural condition, measures of islands and islets vary a lot during ups and downs. The sand alluvium in Chihkan, Houliao, nearby offshore islets, and the south coastline of Jibei Islet is particularly plenty. Dangerous reeves and shoals after being piled up by gravel for years and months have become a special landscape of sand islands.
Mudou islet is located on the North of Jibei Islet, the most north island of Penghu County. It has Mudou lighthouse, the highest lighthouse in Fareast area, established on the islet.
There are Islets such as Birds Islet, Yuanpei Islet and Paisa Islet located on the east of Paisa Island. Over there, the cliff coast is prosperous and pillar basalts stand in great numbers with clear edges.
On the most south end of Baisha Township, Chungtun Islet is a 10-15 meters high independent small basalt island in squared mountain shape. Its old name is Chungtun because the shape is like a stone block, and it is the middle stop between Penghu Main Island and Baisha Isaldn.

Penghu archipelago is located on the volcanic band of Pacific Ocean. The geology is mainly basalts of volcanic lava. Baisha Township is one of the Penghu volcanic archipelagos. The island and offshore islands are approximately basalt base structure. In the exposed sediment of basalts, there is limonite red tuff and black gray sand, and the layers of limonite are all over the island.
Northwest and Northeast Bay of Houliao, the north of Chiangmei, Jibei and Tatsand, Dangerous Reef, Pengpeng shoal are the sediments made of fragments of coral bodies, shells and perforated worm’s shell along with sand and quartz.
Within the Township, it is all sand sticky soil except for the sand soil on the north side of Jebei Islet and Birds Islet. During the winder, the monsoon will scrape off the surface soil. Therefore, the soil is losing and the soil layer is too thin to grow woody plants.