Most of the coastal area is hilly, sometimes even mountainous, and there are few good harbours. The area just south of the coast, known as the Tell, is fertile. Further south is the Atlas mountain range and the Sahara desert. Algiers, Oran and Constantine are the main cities.

Algeria's climate is arid and hot, although the coastal climate is mild, and the winters in the mountainous areas can be severe. Algeria is prone to sirocco, a hot dust- and sand-laden wind especially common in summer.