A desert may contain plains, mountains. valleys, plateaus or almost any landform. The determining factor is not the shape of the land but in the amount of annual precipitation the region receives.
The Sahel is semi-arid grassland. It is not a desert nor is it a plain.
A large piece of flat land is called a plain. A mountain desert refers to a desert area with significant mountainous terrain.
The Great Victoria Desert is located north of the Nullarbor Plain.
Desert pavement
A desert can include a plain, a mountain, plateaus, valleys - almost any landform imaginable.
Desert has no significant vegetation. Coastal plain usually has lots of vegetation.
The Nullarbor Plain
Desert
All; Mountain Plain, desert plain, and bay.
plain
That could be a plain or a desert.
A desert is neither a plain nor a landform. A plain is a landform.