Africa is the world’s second-largest and second-most populous continent, after Asia in both cases. It’s brimming full of BIG things. As the second biggest continent in the world, Africa is jam-packed with some of the world’s biggest things: The largest desert in the world, the Sahara Desert (explore it on our Morocco itineraries). The longest river in the world, the Nile River, runs for 6,853km (4,258mi).