Africa is truly and interesting and exotic place. All those deserts of north, the prairies, and the tropics of the south. Elephants, lions, giraffes, monkeys, reptiles.
And then there's the cultures. The art, the languages, the beauty, and of course, the politics of the countries.
Write about anything that has to do with Africa in general. Be it the nature, the culture, the countries, the animals, etc.