《徐霞客游记·滇游日记四十五》
这是向东下流的水源，即是中间的支峰与东面的支峰分界的起点，不可不辨。
是东下之源，即中支与东支分界之始，不可不辨也。
This was the source of the water flowing eastward. It was also the starting point of the boundary between the central branch and the eastern branch. This is important to note.