Guelta

A guelta ( ar, قلتة, also transliterated qalta or galta; Berber: agelmam) is a pocket of water that forms in drainage canals or

wadis Wadi ( ar, وَادِي, wādī), alternatively ''wād'' ( ar, وَاد), North African Arabic Oued, is the Arabic term traditionally referring to a valley. In some instances, it may refer to a wet (ephemeral) riverbed that contains water o ...

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 (wadi) dries up, there may be pockets of water remaining along its course (c.f. oxbow lake). In Western Sahara, gueltas correspond to oases. Some examples include Guelta d'Archei in Chad and Timia in

Niger ) , official_languages = , languages_type = National languagesBillabong Billabong ( ) is an Australian term for an oxbow lake, an isolated pond left behind after a river changes course. Billabongs are usually formed when the path of a creek or river changes, leaving the former branch with a dead end. As a result ...

- term for a similar type of body of water in Australia Aquatic ecology Bodies of water Geomorphology Oases Wadis Wetlands {{geomorph-stub