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Yan State Great Wall
The Wall of Yan State also had two sections: the Wall of Yishui and the Wall of the North. Construction of the Wall of Yishui, from 334BC to 311BC, was done to guard against the attack from the Zhao, Qi and Qin. It stretched about 250 kilometers (155 miles) from the foot of present Mt. Taihangshan of Yixian County through Xushui and Anxin Counties, via XiongXian County and ended in Wen'an County in Hebei Province.Yan State Great Wall of the North was built to guard against intrusion by nomadic people like the Donghu. This part of the wall was built in 254BC, which was the last wall built in the Warring States Period. This wall went through present Zhangjiakou City of Hebei Province, Inner Mongolia, across Hebei Province, Chaoyang City of Liaoning Province, over Mt. Yiwulu Shan, and reached Liaoyang of Liaoning Province. Now the sites of Wall of Yan can be found in the above-mentioned areas.
