《徐霞客游记·滇游日记三十七》
大概是后峡环绕的夹谷非常深，峡中的水本来很大，及流到峡口时，此园挡住水路，峡中之水，便不经由溪中而渗入地中。
盖后峡环夹甚深，其水本大，及至峡口，此园当之，峡中之水，遂不由溪而沁渗入入地中。
It was probably because the ravine formed by the mountains behind was very deep. The water in the ravine was originally quite deep, but when it reached the exit, the pond blocked its way, and the water seeped into the ground instead of flowing out through the stream.