How much of the Sahara Desert is covered in sand?

Answer 1

Approximately 20-30% of the Sahara Desert is covered in sand dunes. The rest of the desert consists of rocky plateaus, gravel plains, and other types of terrain. The sand dunes, known as "ergs," are the most prominent feature of the Sahara, but they represent only a portion of the total desert area. The Sahara is one of the largest deserts in the world, spanning about 9.2 million square kilometers (3.6 million square miles).