73.9 kilometers. According to Baidu map, Ningbo is located in the middle of Chinese mainland coastline, in the south wing of the Yangtze River Delta, and Ninghai County is located in the middle of Chinese mainland coastline. Ningbo Municipal Government is 73.9 kilometers away from Ninghai County Government, with a drive of 1 hour of 23 minutes, passing through Shenhai Expressway and Yonglin Line.