《水经注·卷三十五》
江水又往东流经郑县老城南边。楚宣王灭邻国，把郑人迁到这里居住，所以叫郑。
江水又东径邾县故城南，楚宣王灭邾，徒居于此，故曰邾也。
The river flows eastward through the south of Zhengxian old city. King Xuan of Chu destroyed the neighboring country and moved the people of Zheng to live here, so it was called Zheng.