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“居庸天险列峰连、万里金汤固九边”.居庸关.史尝有军都关、铁门关、纳款关、蓟门关、西关、■螉塞、冷径等称.位于北京市昌平县西北军都山上:居庸关之称.最早见于《吕氏春秋·有始》:“何谓九塞?大汾、冥厄、荆阮、方城.殽、井陉、令疵、句注、居庸:《淮南子(?)称“天下九塞,居庸其一.”居庸关处于古时太行八陉之一.即军都陉(一名关沟)上.《地记》:“太行、陉、其第八陉为军都.”军都陉为古时蓟燕之地通往晋北和内蒙高原的重要孔道.”《水经注》.载:“居庸关在上谷沮阳城东南六十里.军都在居庸之南.绝谷垒石.崇塘峻壁,山岫层深.侧道褊狭.林鄣邃险.路才容轨.”陉口设关.即居庸关.宋程大昌《北边备对》载:“居庸关.太行山最北之第八陉,东西横亘五十里.中间通行之地才阔五步.”对民庸关地形的险要.古人论述不绝于书,元王中军《中堂纪事》论道:“两山(?)绝,中若铁峡,控扼南北,实为古今巨防.”清雍正《畿辅通志》”关门南北相距四十里,两山夹峙,下有巨涧.悬崖峭壁.称为绝险.”
“Juyong Tianlun even peaks, miles of golden soup solid nine.” Juyongguan. History of the military have been closed, iron gate off, satisfied that the gate, Jimen Gate, the West, ■ congestion, cold trails, etc. Located in Beijing Changping County, northwest military capital hill: Juyongguan said. The earliest seen in the “Spring and Autumn Annals”: “What is nine plug? Dafen, Nephew, Jing Nguyen, Fangcheng. Confused, Jingxing, make defects, sentence note, home Yong said: ”Huainanzi (?) Said“ the world’s nine plug, one of the Juyong. ”Juyongguan in the ancient Taihang eight one of the eight, namely the military capital 一 (a GuanGou)陉, the eighth 陉 for the military capital. “Military capital 陉 ancient Jiyan land leading to the North China and Inner Mongolia Plateau of the important channels.” “Water by the note.” Set: Shili. The military are in the south of the Juyong. Absolute valley fortress. Chong Tang Jun wall, mountain Xiu-deep. Sidewalk 褊 narrow. Lin 鄣 deep danger. Dachang “ready for the north” contains: “Juyongguan. Taihangshan north of the eighth 陉, east-west crossing fifty. In the middle of the road to wide five steps.” The Yongmin off terrain. “Zhongdi Chronicle On the Road: ”The two mountains (?) Must, if the iron Gap, control north and south, it is the ancient and modern giant defense.“ Clear Yongzheng ”Ji Tong Tong Zhi“ ”north and south are 40 miles away from each other, Stream. Cliff cliffs. Called dangerous. "