I saw on the Two Heel Drive blog details of the Eden to Addo Corridor Initiative.
UPDATE – This hilarious picture (the socks are not hers) comes from a collection contributed by 7 hikers, so far. It gives you a good feel for this new hike.
more photos on a group shared Flickr photo stream
This extreme hiking experience is the first of its kind in South Africa, and your opportunity to traverse more than 400km of mountain landscape in the Southern Cape in support of the establishment of conservation corridors.
The objective of the Mega-Hike, is two-fold, firstly to give hikers the opportunity of walking through remarkable landscapes and secondly to raise funds for the Eden to Addo Conservation Corridor Initiative. The mega-hike is an inspiring walk through some of the most incredible landscapes of the region linking various nature reserves, national parks, working farms, communities and private lands.
besthike.com 
Check out the photos on :http://www.flickr.com/groups/edentoaddo/
Nice. I have a link in the post to your pics.
Here’s the Google Earth file of the actual mega-hike, linked to the geotagged photos – http://www.ecoafrica.com/Directors/RalphPina/Eden%20to%20Addo%20Mega-Hike%20Aug%202006.kmz
Enjoy!