Tassili n'Ajjer is a mountain range in the Algerian section of the Sahara Desert. It is a vast plateau in south-east Algeria at the borders of Libya, Niger and Mali, covering an area of 72,000 sq. km. The range is also noted for its prehistoric rock art and other ancient archaeological sites, dating from Neolithic times when the local climate was much moister, with savannah rather than desert. The art depicts herds of cattle, large wild animals including crocodiles, and human activities such as hunting and dancing. The art has strong stylistic links to the pre-Nguni Art of South Africa and the region, executed in caves by the San Peoples before the year 1200 BCE.
The range's exceptional density of rock art paintings-pictograms and engravings-petroglyphs, and the presence of many prehistoric vestiges, are remarkable testimonies to Neolithic prehistory. From 10,000 BCE to the first centuries CE, successive peoples left many archaeological remains, habitations, burial mounds and enclosures which have yielded abundant lithic and ceramic material. However, it is the rock art (engravings and paintings) that have made Tassili World famous as from 1933, the date of its discovery. 15,000 petroglyphs have been identified to date.