» This article is about an Arabic term for valleys or dry riverbeds. For other uses of 'Vadi' see: Vadi (disambiguation). Wadi (also: Vadi) is traditionally a valley. In some cases it can refer to a dry riverbed that contains water only during times of heavy rain. Compare arroyo (creek), canyon, gulch, wash and gully. The term is very widely found in Arabic toponyms. Wadis tend to be associated with centers of human population because sub-surface water is sometimes available in wadis. Crossing… (More on Wadi)