Ffyona Campbell walked South Africa to Morocco in the 90’s – book
Conservationist Mike Fay walked across Gabon and part of Congo. Also a video with introduction and interview.
Ash Dykes crosses Madagascar:
Paula Constant walks across as part of a trek from London. She then carried on across Western Sahara, Mauritania and Mali. Also Paula’s website.
Walking across Reunion on the GR R2 trail: