Southern Africa is a riot of life and color. But if it was not for two great ocean currents that sweep around and shape the continent's Great Cape it would be a desert. This episode celebrates the rejuvenating powers of the ocean.

The Sahara. Covering a vast swathe of Northern Africa, it is the largest desert in the world. On the surface, it appears to be a desolate empty land, but there are a few specialist species who have adapted to this harsh landscape.