In recent years a number of companies have begun to cruise the rivers and coasts of Africa. African safaris often make their way to rivers or waterholes because that is where animals congregate. The river cruises are already there - at first light and as the sun goes down - with perfect front row seats for the animal gatherings.
The Northern shores of Africa are comfortably part of the Mediterranean but the rest of the continent doesn't seem to fit into any of the other geographic categories - thus a separate destination.
Companies offering Africa cruises include: