Ancient Beijing's most important task is to strengthen the North of Beijing Yanshan military defense works. So, on behalf of the rulers to build the Great Wall became the center of attention. There before the Ming Dynasty Great Wall, Yan, Sui Great Wall, Ming Shi You in some of the old Great Wall, based on building a more solid, majestic Ming Great Wall. The Great Wall, especially the winds in the Yanshan in the Ming Great Wall was to defend the division's major military defense, and Beijing between the existence of "teeth" close relationship. This Road, the Great Wall because of its full-length 12700 li, which was called the "Great Wall." The construction of the arduous and long history. Momentum of the majestic, are rare in the world, people of reputation.
Beijing Great Wall section of the North Mountain across Beijing Pinggu, Miyun, Huairou, Changping, Mentougou five counties, total length of 629 km (of which 529 km long trunk, branch stem length 90 meters). Comparison of the entire movement was a complete semi-continuous ring. If their things, the North West 2 to be docked into the distribution system, you can see the old water hole in Huairou County, southwest of the watershed Office (116 degrees east longitude. North latitude and 40 degrees) of - a clear articulation point (referred to as "Beijing knot point" ), this node started eastward, westward, northward, West radiate three different characteristics of the Great Wall. Single shape-based Great Wall to the east. Only in the Pass near the ring, multi-layer body structure like the city. The Great Wall to the west more complex, in addition to passes in the vicinity to build a multi-ring, layered outer walls. Beijing Yanqing Basin and plains in between, but also constructed the two walls parallel with each other to form a solid double-depth defense system. Among them, the north west to the Great Wall in Beijing, the main system in the single-layer-like, is relatively simple in structure. 此外. In the main line on both sides of the Great Wall also happened to see an extension of a feeder, the feeder normally a few hundred meters to several kilometers long.
Author: yhd
