How long is the great wall of china?

Answers (1)

That's like asking how long is a chess board. It is not a single layer of wall: some parts are trenches. It has been under construction almost continuously since 7th century BC and some parts are so badly weathered that they are almost unrecognizable. Estimates of length vary from 5500 miles to over 13,000 miles, depending on what you want to call a wall.

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