wadi -
gully or streambed in northern Africa and the Middle East that remains dry except during rainy season
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Wiktionary
Substantiv
wadi -
A valley, gully, or streambed in northern Africa and southwest Asia that remains dry except during the rainy season.
Wikipedia
Wadi is the Arabic term traditionally referring to a valley. In some cases, it may refer to a dry riverbed that contains water only during times of heavy rain or simply an intermittent stream.