《水经注·卷十四》
自鲍丘水以南，南到淖沱河，西至泉州、雍奴，东到大海，叫做雍奴蔽。
自是水之南，南极滹沱，西至泉州雍奴，东极于海，谓之雍奴薮。
South of Bao Qiu Shui, to the south is Nao Tuo He, in the west are Quan Zhou and Yong Nu, in the east is the vast ocean. This area is called Yong Nu Bi.