《徐霞客游记·粤西游日记三十一》
这才知道自黑区村到此，都是山间夹谷中的平坦山坞但没有涧水，因为在杨村会合的溪流，已先向东流入土山了。
始知自黑区至此，皆山夹中平坞而无涧，以杨村所合之流，先已东入土山也。
Only then did we realize that from Heiqucun to there, there were flat valleys in the mountains, but there were no streams, because the stream that met up at Yangchun had already flowed east into the earthen hills.