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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.
This similarity in purpose may explain the belief that the present wall dates from the Qin Dynasty. The Ming built the wall featuring over 25,000 massive watchtowers and ranging in height from 16-26 feet (5-8 meters), 20 feet across the bottom (6 meters) and 16 feet across the top (5 meters).