South Africa
I did a road trip to South Africa in 2007. I dived in 3 places, Umkomass where the famous Aliwal Shoals are. The equally famous Protea Banks near Margate and the wreck of the Paquita near Knysna.
I've also dived on a Red Sea liveaboard out of Sharm El Sheikh in Egypt and on another liveaboard further south out of Djibouti.