Haimen is a county-level city in the southeast of Jiangsu province of Eastern China with a population of approximately 1 million. It is located at the opposite side of the Yangtze River to Shanghai. Chonghai Bridge links the city to Chongming County. Haimen is the seat of the Roman Catholic Diocese of Haimen. The city should not be confused with the village of the same name in Guangdong province. The area that is now Haimen was formed from silt deposits from the Yangtze River. Several sandbanks, including Dongzhou (Chinese) and Buzhou (Chinese), joined together with the mainland in the Tang Dynasty. In 958 CE, during the Later Zhou Dynasty in the Five Dynasties and Ten Kingdoms Period, Haimen County was established, the seat established at Dongzhou Town.
Contributions by Bloodmerchant, Ethansmith, and SmackBot.