During the Qingli period of the Northern Song Dynasty, Wang Anshi supervised the construction of the Chuanshan Chuanshan Tower in Yinxian County. "Zhenhai County (Transportation) Chronicles" records: "In the Southern Song Dynasty, there were ferries to Changguo (today's Dinghai), which was one of the water passages between Mingzhou Prefecture and Changguo County. The trade is developed. "The trade is developed."
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