1) Sedimentary basin of Africa 
Aoukar or Erg Aoukar is a geological depression area of south eastern Mauritania. It is located between Kiffa and Néma, south of the Tagant Plateau. The Aoukar basin is a dry natural region of sand dunes and salt pans fringed by escarpments on its northern and eastern sides. ==History== There was once vast reed-covered endorheic lake in the area,...