奔峭从天拆悬流赴壑清路回穿石细在北京的西北面,有一道东西横亘的山脉,接太行山而东,达于山海关的东北。这就是有名的燕山山脉,它属于太行山的一支。从居庸关往东长达一千二百多里的明代万里长城,就是起伏盘旋于燕山之上,自居庸关到山海关的。燕山是北京西北的天然屏障,居庸关就坐落在这一屏障之中。自古被称之为“绝险”。居庸的名称,据考证是以秦始皇 Benqiaoshan suspended from the sky go Qinghe Qing Road back through the stone in the northwest of Beijing, there is a mountain that runs through things, then the east and the Taihang Mountains, up to the northeast of Shanhaiguan. This is the famous Yanshan Mountains, which belongs to a Taihang Mountain. The Great Wall of Ming Dynasty, which stretches more than 1,200 miles east of the Juyongguan, swung to and fro from the Yungshan Pass to the Shanhaiguan Pass. Yanshan is a natural barrier to the northwest of Beijing, and Juyongguan lies in this barrier. Since ancient times is called The name of Juyong, according to textual research is based on the Qin Shi Huang