The size of the Great Wall of China makes it one of the most impressive structures ever built. The total length is 8,851.8 km (5,500.3 mi).But the actual length of the wall is 6,259.6 km (3,889.5 mi) while the trenches are 359.7 km (223.5 mi).his area of the Wall is 5 meters (16 ft) wide and 7.8 meters (26 ft) high. The Jiayuguan West Pass is the Wall’s western edge. One of the most striking areas is the steep slopes of the Ming Wall. It is 5 to 8 meters (16–26 ft) high and 1 kilometer (6.8 mi) long. Across the bottom it is 6 meters (20 ft) across.