What terrain does the Sahara desert have?

The Sahara desert is the world's largest hot desert and covers most of North Africa. It encompasses a wide variety of terrain, including:

-Sand dunes: These are the most iconic feature of the Sahara desert and are formed by the erosion of sandstone and limestone cliffs by the wind. The dunes can be hundreds of meters high and stretch for kilometers, creating a sea of sand.

-Rocky plateaus: The Sahara desert is also home to vast rocky plateaus, which are formed by the erosion of ancient mountains. These plateaus are often barren and almost devoid of vegetation.

-Dry river valleys (wadis): Wadis are seasonal watercourses that only flow during heavy rains. They are often deep and wide, and their banks are often lined with vegetation.

-Salt flats (chotts): Chotts are depressions in the desert that are covered with a layer of salt. They are formed when saltwater lakes evaporate, leaving behind the salt deposits.

-Oases: Oases are fertile areas in the desert that are watered by underground springs. They often support a variety of vegetation, including palm trees, and are often home to settlements.