Khatt Atui

Khatt Atui ranks 5th on the list of the longest rivers in Mauritania. This dry riverbed begins near Aousserd in the disputed area of Western Sahara and goes southwest through Mauritania's Dakhlet Nouadhibou and Inchiri Regions, ending in the Banc d'Arguin National Park near Baie d'Aouati on the Atlantic coast east of Iouik. The Atui basin, as defined by the Global Environment Facility's Transboundary Waters Assessment Programme, spans 83,295 square kilometers and is home to an estimated 99,599 people. The wadi is home to the Mauritanian communities of Chami (on the highway between Nouakchott and Nouadhibou), Imkebden, and N'Talfa, as well as the Tasiast gold mine.

In Khatt Atui, the lower portions of a huge ancient river, named the Tamanrasett paleoriver, that flowed over the Sahara to the Arguin Basin during humid periods in the late Quaternary have been postulated as the location of Khatt Atui. Along the Mauritanian side of the wadi, early Neolithic archaeological sites have been discovered.