Wadi
Hydrological feature
A wadi ( WOD-ee; Arabic: وَادِي) is a river valley or a wet (ephemeral) riverbed that contains water only when heavy rain occurs. Wadis are located on gently sloping, nearly flat parts of deserts; commonly they begin on the lowest portions of alluvial fans and extend to inland sabkhas or dry lakes. Permanent channels do not exist, due to lack of...
