The Great Wall of Ming Dynasty is a military defense project built in the northern part of Ming Dynasty, also known as the side wall. The material of Ming Great Wall is similar to that of Qin Changcheng, but different from that of Han Great Wall and Qing Great Wall. After nearly two years of survey and measurement in National Cultural Heritage Administration and the State Bureau of Surveying and Mapping.
On April 18, 2009, the data of the Ming Great Wall was released for the first time: it started from Hushan, Liaoning, near the Yalu River in the east, and reached Juyongguan in the west, and built the foot of Qilian Mountain in the east to Jiayuguan, Gansu. Among them, the length of artificial wall is 6259.6 kilometers; The trench is 359.7 kilometers long; The length of natural insurance is 2232.4 kilometers.
The wall of the eastern danger zone is made of stone and blue bricks, which is very strong. In the Ming Dynasty, the Great Wall started from Yalu River in the east, connected with Qin Changcheng, and reached Jiayuguan in the west, winding for more than 6,000 kilometers, which was a miracle of the world at that time.
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The Great Wall is an ancient defense project with the longest construction time and the largest engineering quantity in China and even in the world. Since the Western Zhou Dynasty, it has been continuously built for more than 2,000 years, and it is distributed on the vast land in northern and central China. Especially since Qin Shihuang, almost all dynasties that ruled the Central Plains had to build the Great Wall.
There are more than ten dynasties such as Han, Jin, Northern Wei, Eastern Wei, Western Wei, Northern Qi, Northern Zhou, Sui, Tang, Song, Liao, Jin, Yuan, Ming and Qing, all of which have built the Great Wall of different scales. The role and cost of construction and persistence in past dynasties are just as Heshui Zuo said, "Hu Bing bowed its head through the ages, and thousands of troops and horses forged peace."
The Great Wall of Ming Dynasty is a military defense project built in the northern part of Ming Dynasty, also known as the side wall. The material of Ming Great Wall is similar to that of Qin Changcheng, but different from that of Han Great Wall and Qing Great Wall. In the Ming Dynasty, the "inner" Great Wall and the "inner three passes" Great Wall were built outside the "outer" Great Wall. The "inner edge" Great Wall was built according to the Northern Qi Dynasty.
It starts from Pianguan at the junction of Inner Mongolia and Shanxi in the west, goes to Yanmenguan and Pingxingguan in the east, enters Hebei, then goes to the northeast, passes through Laiyuan, Fangshan and Changping counties, reaches Juyongguan, and then from north to east, reaches Huairou Siguan, connects with the "Outer" Great Wall, and takes Zijingguan as the center, showing a general north-south trend.
The "Neisanguan" Great Wall is parallel to the "Inner" Great Wall in many places. In some places, the two cities are only tens of miles apart. In addition, a large number of "heavy cities" have been built, and there are 24 "heavy cities" around Yanmenguan. The Ming Great Wall belongs to the last of the three northern defense lines set by Ming Taizu.
Baidu Encyclopedia-Ming Great Wall
People's Network-Tracing the Ming Great Wall in Inner Mongolia