The oddities worth the drive
Blyde River Canyon — one of the world's largest green canyons, on the Panorama Route. The Three Rondavels viewpoint and God's Window are the headline stops; the canyon's scale is the real draw.
The Valley of Desolation near Graaff-Reinet — sheer dolerite pillars rising out of the Karoo plains. An hour's walk from the Camdeboo park; sunset is the time, and it's far quieter than the big-name landscapes.
The Cederberg's rock formations — the Maltese Cross, Wolfberg Arch, and the surreal sandstone shapes around Stadsaal. Combine the landscapes with San rock art.
Sutherland and the Tankwa Karoo — high-altitude semi-desert with SALT, the largest optical telescope in the southern hemisphere, and some of the darkest night skies on earth. Star parties are real here.
The Richtersveld — the mountain desert in the far northwest, a World Heritage landscape few tourists reach.
How to use them
Treat these as routing anchors, not detours. The Panorama Route threads Blyde into a Kruger trip; the Valley of Desolation anchors a Karoo loop; the Cederberg sits between Cape Town and the West Coast. South Africa's strangest landscapes are its most road-trippable — they reward a car and a few days between them.