A wadi is a gully, streambed, or vally which is characterized by being extremly dry. Many wadis flood during the rainy season. They are formed by seasonal or intermittent rains but are dry most of the year. The bottom of a wadi is often coverd in sand and coarse rock, and the sides may by steep and made from sandstone or similar materials. Wadi's can be very dangerous in the rainy season. It is also depositional.
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