The Karoo is a semi-desert that crosses three provinces and takes most of a day to drive through, which is exactly why people stop in it. Distances are long, towns are small and far apart, and the landscape does not change quickly. That slowness is the appeal.
What it has instead of scenery in the usual sense is space, silence and a night sky with almost no light in it. Sutherland, on the escarpment, is dry and high and clear enough that South Africa built its largest telescope there. You do not need one to get the benefit.
The stays are guest farms, village cottages and old Karoo houses, most of them in or near towns like Prince Albert, Graaff-Reinet and Nieu Bethesda. The vegetation is the Succulent Karoo and the Nama-Karoo, two of the nine South African biomes, and further east it gives way to the spekboom thicket the platform is named after: a small succulent that regrows on degraded land and pulls carbon down while it does so.