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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.
After a full investigation, on, April 18th, 2009, it was announced that the length of the Great Wall of Ming Dynasty was 8,851.8 km (5,500miles). The wall extends from Hushan Great wall in Liaoning Province to the Jayuguan Pass in Gansu Province. The section of Great Wall in Beijing is about 550km long.