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How long is the Great Wall of China when all known sections are included?
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Great Wall of China
Great Wall of China, near Beijing.
The total length of all sections of the Great Wall of China ever built is approximately 21,196 kilometers (13,171 miles). This figure accounts for all known sections, including overlapping portions that were rebuilt by various dynasties over the course of two millennia.12
In contrast, the most well-preserved and extensive version of the wall, which dates from the Ming dynasty, measures about 8,850 kilometers (5,499 miles) in length.21