《水经注·卷十四》
白狼水往北流经白狼县老城东面，王莽时改名伏狄。白狼水又往东流，方城川水注入。
乃入海四十里，见海神，左右莫动手，工人潜以脚画其状。
Bailang River flowed north through the east of Bailang Old City; in the time of Wang Mang its name was changed to Fudi. Bailang River flowed east, and Fang’an River flowed into it.