It is always Africa. The forgotten continent. It could be an empty lost planet, like Mars, but there are millions and  of persons fighting to survive in its beautifully sad lands. You can see the metaphor of Africa in a sequence of The Constant Gardener, when people run away through the desert as bandits come to rob and kill them. While white men could get on the plane, black people only have the choice of running faster than their captors. The support of the white man is only an illusion because if times go harder, like in the movie, there is no chance to save Africans.