《水经注·卷三十七》
温泉水发源于北山岩洞中，洞深三十丈，水源冬夏都在沸腾，常常像汤一样热。
水发北山石穴中，长三十丈，冬夏沸涌，常若汤焉。
Wenquan River originates from the cave of Beishan Mountain. The cave is 30 feet deep, and the water source boils both winter and summer, often as hot as soup.