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The Great Wall of China is the longest defensive wall in the world, stretching across the northwest of China. Its ruins begin by the sea in Po Hay bay. It heads west through the north of Beijing and runs southwest, dividing the Huang-Ho river in two. It continues from the south of the Gobi Desert towards the west.

The length of the wall with its collapsed parts is 8851.8 [1] kilometers. The standing part today is the 2,500-kilometer embankment from the Ming Dynasty. However, the main construction was made between 221 BC and 608 AD. According to another archaeological research, it has a total length of 21,196 km with all its branches.

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