This post’s photos are not looking at the nearby “castles”, but the pictured bones, the cracked “skin” of the ground on which some of them sit, and the “castles” are all existentially indebted to the same kind of event.
It is an event that very rarely and only very briefly occurs in this nigh-rainless place: the Hoarusib River in silt-laden flood, so close to the Atlantic’s “Skeleton Coast”.
You’ll see the “castles” in the next two posts.
The location of #10, #11 & #12 in this series is part of the Hoarusib/its valley, but is a side-canyon, just off the riverbed-proper.
Its “floor” is a little above the riverbed-proper, the Hoarusib only delivers water and silt to this side-canyon when the river-proper is really “roaring”.
In this side-canyon it can be a prodigiously long time between “drinks” and any “muddiness”.
It is not such a rare thing for parts of the riverbed-proper to be “surprisingly” well-grassed, to look green.
Not so on this side-canyon’s floor; whilst definitely not 100% devoid of vegetation, it is most unlikely, ever, to look green.