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Dimensions: How long, high, and wide. Simatai Great Wall is 5.4 km (3.4 miles) long, with altogether 39 watchtowers. At the east of Simatai, the elevation goes abruptly up from 295 meters (968 ft) to 986 meters (3,235 ft), making a breathtaking scene. The wall is very steep and perilous, with the narrowest part only 40 cm wide.
How many people built the great wall of china? Approximatly it took 500.000 people to build the Great wall of china. How Materials were Moved. Because of the lack of technology for moving materials, some of the large stones and other materials had to be moved purely by the laborers. They would slowly move larger objects to the necessary areas.