Jisho

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Wikipedia definition
1. Hangu PassHangu Pass was a strategic pass in ancient China just south of the great eastern bend of the Yellow River in today's Lingbao, Henan Province. The State of Qin built the pass in 361 BC as its eastern gate. Because of its strategic location between the ancient lands of the State of Qin and the central plains of China, many famous ancient battles were fought at Hangu Pass.
Read “Hangu Pass” on English Wikipedia
Read “函谷関” on Japanese Wikipedia
Read “Hangu Pass” on DBpedia

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