Nissan:
http://www.nissanafrica.com/en/web/head ... r_1861.htm
Some of the countries that are not covered on the map are Western Sahara, Morocco, Algeria, Tunisia, Libya, Egypt, Sudan, Somalia, Sierra Leone, Togo, Namibia and Botswana.
Nissan's "official" coverage of Africa as a percentage of countries is about 75%
Toyota
http://www.toyota-africa.com/
Here you will notice that countries not covered include Western Sahara, Algeria, Libya, Gabon, Namibia and Botswana.
Toyota's "official" coverage of Africa as a percentage of countries is about 87%
Other?
Mitsubishi Motors has coverage in around 83% of African countries, including Algeria and Libya (http://www.mitsubishi-motors.com/).
Land Rover seems to have about 69% "official" coverage in Africa (http://www.landrover.com/gl/en/lr/marke ... ion=africa).
So it is clear that Toyota covers more countries than the others investigated, but the difference is not as great as many seem to believe. Also, the importance of the specific areas covered or not covered by the one or the other manufacturer obviously depends on where you intend going.
By the way, the reason why Nissan and Toyota both have no information on coverage for Namibia/Botswana is because these regions are supported directly by dealers that fall under the Nissan/Toyota South Africa regions. The same applies to Lesotho and Swaziland.
Of course the info above says nothing about the quality of support on offer, regardless which manufacturer...
....As they say though, always out-numbered never out-gunned! 
I found your info extremely interesting (in particular the point re LR coverage ! yet nobody there would have advised against african travel by means of LR based on dealership coverage 
)
