《明史·志·卷六十》
杨一魁又说： 归仁在西北，泗州在东南，相距一百九十里，中间隔有重重山冈层层险峰。
一魁复言： 归仁在西北，泗州在东南，相距百九十里，中隔重冈叠嶂。
Yang Yikui said again: Guiren is in the northwest, and Sizhou is in the southeast. They are 190 miles apart, with many hills and peaks in between.