《水经注·卷十四》
辽水在右汇合白狼水。白狼水发源于右北平白狼县东南，往北流，再折向西北，流经广成县老城南面，就是王莽时的平虏，俗称广都城。
新河东绝清水，又东，木究水出焉，南入海。
Liaoshui joins Bailang River to its right. The Bailang River originates from the southeast of Bailang County in the northeast of Beiping, flows north, and then northwest, flowing through the south side of the old town of Guangcheng County, which is the Pinglu of Wang Mang, commonly known as Guangdu City.