Ayoun al Atrous is a town in southern Mauritania. It is located at around 16°40′0″N 9°37′0″W / 16.66667°N 9.61667°W. It is the capital of Hod…Ayoun al Atrous is a town in southern Mauritania. It is located at around 16°40′0″N 9°37′0″W / 16.66667°N 9.61667°W. It is the capital of Hodh El Gharbi region. The city is served by the Aioun el Atrouss Airport, 6 kilometres north-west of the city. The town is located in the southern area of the Aoukar, a former lake basin.