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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.
World of walls: How 65 countries have erected fences on their borders â four times as many as when the Berlin Wall was toppled â as governments try to hold back the tide of migrants. 1  Security fears and a widespread refusal to help refugees have fuelled a new spate of wall-building around the world.