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Petra, ancient city, center of an Arab kingdom in Hellenistic and Roman times, the ruins of which are in southwest Jordan. The city was built on a terrace, pierced from east to west by the Wadi Mūsā (the Valley of Moses)—one of the places where, according to tradition, the Israelite leader Moses struck a rock and water gushed forth. The valley is enclosed by sandstone cliffs veined with shades of red and purple varying to...