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guelta
A guelta (or qalta or galta or agelmam), from Arabic:قلتة which means a lower level of height in ground between rocks which holds water, 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 rivers (wadis) dry up there may remain pockets of water along its course (c.f. ox-bow lake).〔 In Western Sahara, gueltas correspond with oasis.〔
Some examples include Guelta d'Archei.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「guelta」の詳細全文を読む
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