Wadi is an Arabic word often translated to valley. Officially wadi refers specifically to dry river beds and can also relate to smaller geographic formations.
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In Arabic, Wadi Musa translates to the Valley of Moses. It is named this because it is believed that Moses walked through the valley with his followers.
According to Arab tradition, Petra is the spot where Moses struck a rock with his staff and water came forth, and where Moses' brother, Aaron, is buried, at Mount Hor, known today as Jabal Haroun or Mount Aaron. The Wadi Musa or Wadi of Moses is the Arab name for the narrow valley at the head of which Petra is sited.