It passes through 10 provinces, cities and autonomous regions in north China, including Liaoning, Hebei, Tianjin, Beijing, Shanxi, Inner Mongolia, Shaanxi, Ningxia, Gansu and Qinghai.
It has an artificial wall of 6259.6 kilometers, 359.7 kilometers of trench cutting part, and 2232.5 kilometers of natural defensive barriers such as hills and rivers.
GPS positioning system, infrared range finder and other mapping technologies have been used during the survey. The survey will now go on to research the Qin and Han Dynasty Great Wall and other portions of the Great Wall, lasting until late 2010.
-- (Xinhua news, Apr.19, 2009)
