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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.
The total length of the Great Wall of China built in different dynasties is 21,196.18 kilometers (13,170.70 miles), announced by China's State Administration of Cultural Relics in 2012. The length of the Great Wall of the Ming Dynasty (1368-1644) is 8,851.8 kilometers (5,500.3 miles), and there is about 526 kilometers (327 miles) lying in Beijing.