Ksour (plural) or Ksar (singular) is a North African Arabic terms meaning signifying a castle or a village. Often they included withing a single surrounding fortified wall houses and granaries, shops, baths and mosques. They became the seeds of flourishing communities and centers of Islamic development in the region.
There were four such ksour in Mauritania and they are remembered on this banknote. They are Ouadane, Chinguetti, Tichitt and Oualata. These have now been designated UNESCO world heritage sites.