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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.
However, if including all the walls built in different dynasties around China, the total length will exceed 50,000 kilometres.(The precise total length of Great Wall confirmed by the latest research work in 2012 is 21,196.18 km.) The Great Wall is not just a wall.