I read that the vredefort crater was the largest confirmed in the world. It has a diameter of between 250 - 300 km based on what wikipedia said.
Based on those dimensions, I think I actually drove through part of the crater when I went from the Johannasberg International Airport to Inyati.
Am I right? I didn't go to the crater though. Did I miss much (friend of mine is now thinking about visiting after I raved about SA and was curious about this)?