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The Great Wall of China: Project Facts

The Great Wall was completed in the fourteenth century under the Ming Dynasty. It extends more than 4,000 miles (6,400 kilometers) from the Gulf of Bohai to Gansu province.  The wall was erected as a defense against barbarian invaders from the north.

  • The first 1,500 miles (2,500 kilometers) were built from 215 BC to 206 BC under the leadership of Emperor Qin Shi Huangdi.
  • The Great Wall is built of stone, bricks, and pounded earth. It consists of two parallel walls about 33 feet high (10 meters), topped by a wide paved road.
  • Lookout towers were added to the wall every 1.5 miles (2.5 kilometers), guard posts every 3 miles (5 kilometers), fortresses every 9 miles (15 kilometers), and barracks every 31 miles (50 kilometers).
  • The Great Wall is spectacular to see; not only for its length but also for the perfect way it fits into its natural surroundings. It follows the outline of the mountains so perfectly that parts of the wall run almost straight up and down.

Copyright ©  James N. Salapatas, PE, PMP  All Rights Reserved.