About
The Tassili N'Ajjer National Park (Tassili N'Ajjer National Park until 2011) is an Algerian national park located near the town of Djanet, Illizi Province, in southern Algeria.
The vast 138,000 km2 Tassili N'Ajjer Cultural Park is home to the Tassili N'Ajjer Plateau, which is more than 1,000 meters high. It extends over 60 km from east to west and 800 km from north to south, an area with an area of approximately 72,000 km2. Rock formations resulting from erosion emanating from sand dunes stand on its entire surface, showing from afar the ruins of an-cient cities.
The topography of Tassili N'Ajjer is particularly alarming, with enormous rocky plains that sometimes give way to stacks of hewn monoliths - rugged pits that can only be reached on foot or camel - and numerous cliffs and gullies in which we sometimes find the Qalat. Its levels are raised by rare and violent storms that flood the desert every two or three years.
Tassili N'Ajjer is composed of sandstone, which is composed of important sed-imentary deposits overlaid with clay and hardened sand resulting from the par-tial erosion of the crystalline mountains in the Paleozoic era (from -541 to -252.2 million years (and were deposited by the Mesozoic oceans (from -252.2 to -66 million years ago), which covered all of the present-day desert. Then, strong climatic and water changes caused the rocks to be eroded and formed about 4 million years ago.