I have given this top rating because it was extremely comprehensive and, in fact, the only source which I found which covered both of the two areas of South Africa that we visited.
It was very useful both in Mpumalanga and the Eastern Cape, especially the latter. This was because this region is not as popular a tourist region as others yet was stunningly beautiful and vastly underrated as shown by its emptiness. Also, in this region, there was a lack of tourist information generally; except brouchures from the hotel so the book complemented this meager resource admirably.
Masses of information with street plans and maps of smaller scale covering larger areas.