《水经注·卷三十三》
丙水发源于该县东南的柏枝山。山下有丙穴，洞宽数丈，洞中有嘉鱼，常常在暮春时节游到沙洲旁，初冬时进入洞内，或许也像褒汉、丙穴之类吧。
水发县东南柏枝山，山下有丙穴，穴方数丈，中有嘉鱼，常以春末游诸，冬初入穴，抑亦褒汉丙穴之类也。
The Bing River originates from Baizhi Mountain, southeast of this county. At the bottom of the mountain is a Bing cave. The cave is several zhang wide. There are excellent fish in the cave. They often gather by the sandbank in the late spring and enter the cave in early winter. Perhaps it is like Bao Han, Bingxue, and so on.