Seafood hang lung plaza. Seafood hang lung plaza, located in the downtown area of Sheyang County, is a shop specializing in selling seafood in Sheyang, which has been well received by many local citizens. Sheyang County belongs to Yancheng City, Jiangsu Province, and is located in the coastal center of Jiangsu Province. Sheyang county is located in the mid-latitude of the northern hemisphere, on the coastal edge of Eurasia.