What is the origin of the Great Wall in Wan Li?

The history of building the Great Wall can be traced back to the Western Zhou Dynasty. In order to resist the attack of nomadic people in the north, the Zhou Dynasty built a series of castles "Fierce Cities" for defense.

During the Spring and Autumn Period and the Warring States Period, in order to compete for hegemony and defend each other, countries built the Great Wall on their borders according to their respective defense needs. The earliest building was the "Chu Fangcheng" in the 7th century BC. Later, the vassal states of Qi, Han, Wei, Zhao, Yan, Qin and Zhongshan all built the "Great Wall of Mutual Defense" for self-defense.

After Qin destroyed the six countries and unified the world, Qin Shihuang connected and repaired the Great Wall of the Warring States Period, which was called the Great Wall of Wan Li. The Ming Dynasty was the last dynasty to overhaul the Great Wall, and most of the Great Wall seen by people today was built at this time.

According to the results of the national Great Wall resources survey conducted by cultural relics and surveying and mapping departments, the total length of the Great Wall in Ming Dynasty was 885 1.8km, and it was more than 1 1,000 km in Qin and Han Dynasties and its early period, and the total length was more than 2 1 1,000 km.

Extended data:

The length of the Great Wall

Because of its long history, most of the Great Wall in the early dynasties was incomplete, and the Great Wall built in the Ming Dynasty was well preserved, so people generally called it the Great Wall of the Ming Dynasty, which means the length of the Great Wall.

National Cultural Heritage Administration and the State Bureau of Surveying and Mapping jointly announced on April 8, 2009 that the Great Wall of Ming Dynasty starts from Hushan, Liaoning Province in the east, ends at Jiayuguan, Gansu Province in the west, and passes through Liaoning, Hebei, Tianjin, Beijing, Shanxi, Inner Mongolia, Shaanxi, Ningxia, Gansu and Qinghai provinces/0/56 county, with a total length of 88,556. After passing through the trench of 359.7 kilometers, the natural natural barrier is 2232.5 kilometers.

On June 5th, 20 12, National Cultural Heritage Administration announced at Juyongguan Great Wall in Beijing that after nearly five years' investigation, the total length of the Great Wall in China was 2196.18km, including the Great Wall, trenches, single buildings, enclosed castles and related facilities. 46638.68686866687

This is the first time that China has scientifically and systematically measured the total length of the Great Wall. The investigation and appraisal of the Great Wall not only identified the length of the Great Wall in Ming Dynasty measured in 2009, but also carried out the investigation of the Great Wall resources in Qin and Han Dynasties and other periods.

Baidu Encyclopedia-Great Wall (the first military project in ancient China)