Answered by Julie
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Feb. 20, 2013 21:50
Most of the sections were built in northern part of China including Ningxia the Ningxia Hui Autonomous Region, Gansu Province, Shanxi Province, Shaanxi Province, Hebei Province, Beijing, Tianjin, Liaoning Province. Presently, only the sections in Beijing and Tianjin are best protected. Sections in other provinces cannot be found or only the ruins left.
These are all I know.