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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.
Historical records show that 1,200 watchtowers and blockhouses were built on the Great Wall between Shanhai Pass and Beijing. Each watchtower was generally garrisoned by 60 officers and men, with half the number guarding the tower and the other half deployed behind the battlements on the wall.