What terrain does the Sahara desert belong to and what are its characteristics?

There are many types of arid landforms in the Sahara desert. It consists of rocky desert (rocky desert), gravel desert and desert. Rocky deserts are mostly distributed in the high-lying areas in the central and eastern Sahara, and the Nubian desert east of the Nile River is dominated by rocky deserts. Gravel desert is more common between rocky desert and desert, mainly distributed in the rocky area of Libyan desert, Atlas Mountain, Kuxi Mountain and other piedmont alluvial fan areas. Desert is the most extensive, except for a few mountains and plateaus, which are widely distributed everywhere.