Great, great RR! I have a group of mates in the Hoedspruit/Pietersburg/Tzaneen areas. We ride areas like this every weekend. We do it on 250/300cc enduros though, which makes it easier. We tried Bewaars Kloof a couple of weeks ago, but the water was flowing in the kloof, making it too treacherous. We instead went up and over the mountain to the right of the kloof which was also very challenging,definitely not for the unfit! The dry river beds in you pics were flowing, so we criss-crossed them all the way to some little abandoned town. Quite sad to see. I'm definitely going back when it dries out.
This is real adventure riding. Not DS posing on porky, clumsy heavy weight pavement turtles. Real adventure riding!
Anyone wanting to join us anytime, PM me. I'd say relative fitness and an enduro bike are essential though. You'll make it on a 450, but you are likely to burst a lung or two, and life will be unpleasant.