It may look insane, but the guy at the picture is not a Photoshopped silhouette placed over a fake landscape. He's swimming at the Devil’s Pool, a natural rock pool at the very top of the Victoria Falls, at Zimbabwe, with a height of about 100 metres.
The Victoria Falls is a waterfall situated in southern Africa between the countries of Zambia and Zimbabwe. From September to December, due to low water levels, it is possible to swim at the edge of the falls in a naturally formed safe pool, accessed via Livingstone Island.
"Seems like a very unique, and if you're not careful, once-in-a-lifetime experiences!"