Hodh El Gharbi is a region in southern Mauritania, with an area of 53,400 square km. The population at the 2013 census was 294,109. Its capital is Aïoun. The region borders the Mauritanian regions of Tagant to the north, Hodh Ech Chargui to the east and Assaba to the west. To the south in borders Mali, and a part of Malian territory protrudes into the region. The Aoukar basin, which formerly gave name to a greater region, is located in the northern and central part of Hodh El Gharbi, extending eastwards.