Hangu Pass was first built by the Qin State in the Spring and Autumn Period and the Warring States Period, because the pass was in the valley, and it was as dangerous as a letter, so it was named Hangu Pass.

Hangu Pass is located in a deep and dangerous valley, the terrain is dangerous, and only one carriage can be allowed to pass in the narrow place, as the so-called

"The car is not square, and the horse is not bridled". Hangu Guanxi is based on the plateau, east of the river, south of the Qinling Mountains, north of the Yellow River, is one of the earliest Xiongguan fortresses built in ancient times.

Founded in the Spring and Autumn Period and the Warring States Period, it is the throat of Luoyang in the east and Chang'an in the west

"In the Tiankai Hangu Zhuang Pass, the valley is shocked to the north sky",

"Twin peaks towering beside the river, since ancient times the battle of Hangu...

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