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Aquila wahlbergi
Taken at the Pongola Game Reserve in northern KwaZulu-Natal, on route to the Swaziland border.
There are a couple of raptors that this could be. They look very similar in size and appearance:
Whalberg's Eagle - Aquila wahlbergi : http://en.wikipedia.org/wiki/Wahlberg%27...
Tawny Eagle - Aquila rapax : http://en.wikipedia.org/wiki/Tawny_Eagle...
Steppe Eagle - Aquila nipalensis : http://en.wikipedia.org/wiki/Steppe_Eagl...
I think it's less likely to be the third but I would need to do a bit more research into ranges (wiki says that they overwinter in Africa). I hope this helps.