Guelta
A guelta is a pocket of water that forms in drainage canals or wadis in the Sahara. The size and duration will depend on the location and conditions. It may last year-round through the dry season if fed by a source such as a spring. When a river dries up, there may be pockets of water remaining along its course. In Western Sahara, gueltas correspond with oases.
Some examples include Guelta d'Archei in Chad and Timia in Niger.
