The Tassili n'Ajjer (It is a name from the Berber language and its English name is: "Tassili Plateau") is a mountain range in the Sahara desert in southeast Algeria, North Africa. The highest point is Adrar Afao, 2158 m. The nearest town is Djanet, about 10 km southwest of the range.The range is composed largely of sandstone. Erosion in the area has resulted in nearly 300 natural rock arches
