《水经注·卷二十八》
城西南有赤板冈，冈下有一条水渠，往东北流入城内，名叫子肯读。是吴国军队入郑时开凿的，称为西京湖。
城西南有赤坂冈，冈下有渎水，东北流入城，名曰子胥渎，盖吴师入郢所开也，谓之西京湖。
There is a Chiban Ridge to the southwest of the city, with a canal below it, flowing northeast into the city, called Ziken Read. It was dug when the Wu army entered Zheng, and is called Xijing Lake.