Bed remaining dry until the rainy season (4)

I believe the answer is:

wadi

(Other definitions for wadi that I've seen before include "Periodically wet ravine" , "Seasonally dry channel" , "Rocky watercourse in N Africa" , "Mainly dry ravine" , "North African gully, dry except in the rainy season" .)

I've seen this clue in The Guardian.

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