For quite some time, in the distant past, the Hoarusib River must have carried a lot more water, a lot more often, and had much more erosive power.
Now, most of the time, the pictured section of the river provides a non-challenging “road” for 4WD vehicles.
Here, not very many kilometres in from the Atlantic, the Hoarusib has cut a spectacular gorge, through volcanic rock.
I think (underline think) that the sides of the gorge are mostly comprised of dolerite, basalt and granite.
Photo is copyright Doug Spencer, taken at 12. 26 pm on 14 November 2022.