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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 did it have to take to build the Great Wall of China? Many thousands of people were involved in the building of the wall. From records it appears that 300,000 soldiers and 500,000 common people were involved in constructing the o â¦ riginal Great Wall under Emperor Qin.