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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 Great Wall stretches across North China from east to west for over 6,000 kilometers. It extends from the Shanhai pass at the seaside in the Hebei province in the east to the Jiayu pass in Gansu province in the west. The sites of the Great Wall stretch across 15 provinces of China. 4. How was the Great Wall of China built?