Tassili n'Ajjer

Tassili n'Ajjer is a mountain range in the Algerian part of the Sahara Desert. The name means "Plateau of the Rivers". It 72,000 km2. large. The range is mostly made of sandstone. 
It is known for the prehistoric rock art. The art has herds of cattle, large wild animals including crocodiles, and human activities such as hunting and dancing. 
The nearest town is Djanet. It is about 10 km southwest of the range.