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北京关沟是从南口到八达岭的那条山沟,长20公里。关沟古称军都陉,太行八陉之一,曾经是明代北京防卫体系的重中之重。关沟因关城林立而得名,从八达岭外的岔道城算起,一路要经过八达岭关城、水关、上关(现为遗址)、居庸关到南口关共六道关口。其中八达岭关城和水关处于长城线上,其余四关属于关沟防御体系的纵深布置。笔者收藏的一些百年老图画明信片,再现了八达岭关沟的过去。和现在的八达岭关沟对比,我们看到了它的巨变。
Beijing Guan ditch is from the south to Badaling ravine, 20 km long. Guanqu dynasty known as the military capital, one of the Eight Banners Taihang, was the Ming Dynasty Beijing defense system top priority. Guan Gulou name because of the Guancheng, from the Badaling Ridge outside the city, all the way through the Badaling Guancheng, Shui Guan, Shangguan (now the site), Juyongguan to the mouth of the South Pass six pass. Among them, Badaling Guancheng and Shui Guan are on the Great Wall Line, and the remaining four guards are arranged in depth along the Guan Gou defense system. Some of the author’s collection of 100-year-old picture postcards, reproduced the past Badaling Guan ditch. Compared with the current closure of the Badaling ridge, we have seen its great change.