Desert pavement
The Sahel is semi-arid grassland. It is not a desert nor is it a plain.
The Great Victoria Desert is located north of the Nullarbor Plain.
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
plain
Desert
All; Mountain Plain, desert plain, and bay.
The Australian term for this is a "gibber plain" or gibber desert.
plain
That could be a plain or a desert.
A desert is neither a plain nor a landform. A plain is a landform.