Mainland Africa’s ‘peanut butter sandwich’ of national wealth. Tropical African countries constitute a thick core between two thinner slices of countries in the north and south temperate zones. All temperate mainland African countries except landlocked Lesotho in the south have average annual incomes above $2,400 (gray), ranging up to over $12,000. All except three tropical mainland African countries—Equatorial Guinea, Gabon, and Angola— have average incomes below $2,200 (red), ranging down to as low as $170 (Burundi).