Jiangjun-ao, located near Wang-an, is named for a general (Jiangjun). Jiangjun was a subordinate of Jeng Cheng-gung, the late-Ming loyalist who drove the Dutch from Taiwan, who was once stationed here. Large deposits of high-quality veined stone were once quarried here, but the reserves have become exhausted and the mining has stopped. The large number of imposing buildings on the island gives it the appearance of greater prosperity than the usual Penghu fishing settlement, and have even prompted some people to call it Little Hong Kong. The island's wealth is reflected in the ornate opulence of its Jiangjun,Yong-an, and Tianhou (Mazu) temples.

Chuanfan (Sail) Islet, located to the east of Jiangjun-ao and named after its sail-like shape, is connected with its larger neighbor by a land bridge at low tide, but becomes a true island at high tide.