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Derbent is a city in the southeast Russian republic of Dagestan. It stands on a narrow strip of land between the Caucasian foothills and the Caspian Sea that forms a natural pass. Historically, Derbent’s strategic position allowed it to control Eurasian traffic, and the city boasts massive fortifications dating to the 6th century CE. Though they were probably built by the Persians to guard against northern invaders, the walls are sometimes associated with what legendary structure? Discuss
Source: The Free Dictionary