《徐霞客游记·游雁宕山日记后》
往北上三里，一座山脊平行峙立，狭窄得如同一道墙，两端高高昂起，北面像崩塌一样地直落下去，就是南阁溪横着流过去的分界，不像南面那样回环交错。
北上二里，一脊平峙，狭如垣墙，两端昂起、北颓然直下，即为南閤溪横流界，不若南面之环互矣。
Heading north for three miles, a ridge stood side by side, as narrow as a wall, with both ends rising high. The north side was as if it had collapsed and fell straight down. It was the boundary where the Nange Creek flowed horizontally, unlike the south side. The side that was intersected and intertwined.