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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.
6. How long did it take to build the Great Wall in China? The Great Wall of China was built in several stages, not in one continuous effort. Beginning is the 6-7th century BC and ending in the 16th century AD. 7. How wide and how tall the Great Wall of China is? The Great Wall is wide enough at the top for five horses or ten men to walk side by side. The Great Wall ranges in height from just a few feet to over 30 feet tall.