English: Hongcheng Fort (Chinese 紅城, Mongolian 乌兰德勒布井), meaning "Red Fort" is a Han dynasty frontier fortress, situated about 15 km south of Dalaihob and 10 km northwest of Kharakhoto, in Ejin Banner, Inner Mongolia. It was part of a series of defensive fortifications known as the Juyong Forts (Chinese 居延城) which were established during the Western Han in 102 BCE and were abandoned at the end of the Eastern Han.
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