One for my South African audience.

So there I was, cruising through the Smithsonian National Museum of Natural History in Washington DC, in absolute awe of some wildlife photography on display in a special exhibit, when I came across the following photo. The photo itself is pretty impressive, you have to admit. A lot of thought went into taking it as is evident from the explanation on the board crediting the photographer. What I would like to know though is which part of the Transvaal exactly was this photo taken?