Mark, South Africa has not problem putting a together a top 50 list of golf courses and many of them are meritorious. In fact, in addition to the ones Bob cites, the country has had something of a course-building boom over the last 5 years or so, so there are a lot of new ones to choose from.
What they may lack in architectural pedigree many will make up for through scenery, charm etc - if you allowed to say that on GCA! Zimbabwe has some good courses, like Leopard Rock and Mauritius has a few, but I think the continent as a whole is not that blessed.
Having said that, I can think of a number of quite well established countries which might fail to match the stellar courses in the areas you cite.