The term 'North African Citadel' refers to two distinct structures, the Casbah and the Kasbah. The Casbah is a type of fortress found in North African cities, typically built with high walls and narrow alleys. It was originally used as a defensive structure, but today it is often used as a residential area. The Kasbah is a type of fortified village found in North Africa, usually located on a hilltop or in a valley. It is typically surrounded by a wall and is used as a place of refuge and protection. Both the Casbah and the Kasbah are important cultural and historical sites in North Africa.