Rites of Zhou
The "Rites of Zhou" records, "The southeast is called Yangzhou." By this saying, the ancient Yangzhou would then cover the entire southeastern China, an area larger than the Yangzhou defined in the "Tribute of Yu" and "Erya". This definition is even more sketchy than the above two, because it is unclear whether the modern city of Yangzhou in Jiangsu could be within the ancient Yangzhou or not. The accuracy of the "Rites of Zhou" itself is also in question. The "Lüshi Chunqiu" similarly mentioned that "the southeast is Yangzhou."