Aoukar or Erg Aoukar (Arabic: عوكر) is a geological depression area of south eastern Mauritania. It is located between Kiffa and Néma, south of the Tagant Plateau. The region is also referred to as Hodh or El Hodh (Arabic: الØوض, lit. 'the Basin').
The Aoukar basin is a dry natural region of sand dunes and salt pans fringed by escarpments on its northern and eastern sides.
The Karakoro River (French: Rivière Karakoro) is a small seasonal tributary of the Sénégal River that forms part of the Mali–Mauritania border. The source of the river is northeast of Kiffa in Mauritania. The river flows south in the flat Sahel region of southern Mauritania, crossing a number of shallow depressions, before joining the Sénégal River on the left bank a few kilometres downstream of the small Malian town of Ambidedi.
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