In north China, there are several sections of large, strong walls. They wind along the Gobi Desert, up and down mountains and meet the sea to the east. These make up the famous Great Wall of China. The Great Wall with all of its divisions measures out to be over 21,000 km. It is recognized as one of the ten wonders in the world. As early as the 7th century BC, the agricultural nations started to build the Great Wall to protect themselves against the raids and invasions of the nomadic groups in the north. Therefore, the Great Wall is not merely a stone wall, but a complete military defense system.
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