《水经注·卷十五》
上面有个堡垒，叫袁术固，堡垒四周围绕着深涧，地势险峻，高达百初，方圆四五里；有一条水，积聚不流，因此溪涧也因这座堡垒而得名了。
上有袁木固，四周绝涧，迢递百仞，广四五里，有一水，渊而不流，故溪涧即其名也。
There is a fort above, called Yuanshu Fort, around the fort there are deep streams, the terrain is rugged, with a height of more than 100 feet, and it covers an area of 4 to 5 acres; there is a stream that does not flow, so the stream also gets its name from this fort.