《徐霞客游记·楚游日记七》
这晚，船夫乘风顺，傍黑后又行十五里，停泊在石坝里，这是白水的上游。
去祁阳九十余里，又在东北。是耶，非耶？
The boatmen take advantage of the current to sail fifteen more li after dark and anchor the boat at Shiba, which isupstream of Baishui.