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Because it is located so far south, and the coastal plain quickly rises into high land, South Africa is one of the very few African countries that do not suffer from the curse of malaria, as mosquitoes find it difficult to breed there. This allowed the European colonialists to push into its interior much further and faster than in the malaria-riddled tropics, settle, and begin small-scale industrial activity which grew into what is now southern Africa's biggest economy.