The great wall is the famous wall of China continued to be built with soil and rock from the 5th century BC until the 16th century, to protect the Chinese Empire from Xiongnu attacks, Mongols, Turks, and other nomadic tribes arrived from the region of Mongolia and Manchuria. Some of the walls are built from the 5th century BC, of which the most famous is the wall caused by the first emperor of China Qin Shi Huang ordered the construction of between 220 BC and 200 BC, situated to the North beyond the great wall of China built during the Ming dynasty, and currently only the few relics.The other purpose of the great wall covering border control, which allows to impose taxes for goods shipped by the Silk Road, regulation, encourage trade and immigration control. Furthermore, the characteristics of the great wall has been enhanced by the construction of watchtowers, military camp, military stations, signaling that the aggressors through the medium of smoke or fire, and the fact that the path of the great wall also serves as a transportation corridor.A preliminary study published in 2009 estimated length works 8,850 km (3,948 miles). But according to the new figures were announced, the great wall is long 21,196 km length was made based on a recent survey. The average height of the wall is 7 meters above the ground, the top of the broad market averages 5-6 m. The great wall starts from Shanhaiguan on the Bohai Sea in the East, at the limit between China proper ("the land of China is") and the Manchus to Lop Nur in the southeastern part of autonomous region of Uyghurs in Xinjiang [1]
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