《水经注·卷二十七》
汉末则是西城郡。建安二十四年设置。甲水又往东流，在右面注入汉水。
甲水又东，右入汉水。
Han River flows eastward again, there is Long Yuan, the source of the Yuan is a mountain, the rock on the mountain looks like a Hu’s nose, therefore it is called Hu Bi Mountain; and there is Long Jing in the down, with depth of several yards.