《水经注·卷二十五》
沂水又往南流经爆山西面，爆山有两座山峰，相距一里，双峰都很秀美，浑圆的山形看来一模一样。
沂水又南径爆山西，山有二峰，相去一里，双峦齐秀，圆峙若一。
Yi River continues to flow south, passing the west side of Baoshan Mountain. Baoshan Mountain has two peaks separated by a mile, and both are attractive, resembling perfectly round hills.