Nandu River
Dinghai Bridge (in Chinese 定海大桥, and formerly 定马大桥) is an arch bridge over the Nandu River. The bridge connects Ding'an County on the south side of the Nandu, and Dongshan town in Xiuying District on the north. The bridge is located around 1 km west of Dingcheng and is the main access to that town from the north side of the Nandu. Dingcheng is located on the south side of the Nandu and is the main city in the county.