9. Zambezi River (Zambia)
This river is incredibly rushing and hides many dangers, including the huge stones and trenches hidden under the swirling waves. It’s almost 3,000km long, peppered with unexploded mines, killer rapids and deadly animals such as crocodiles and hippos. The Victoria Falls, the largest waterfalls in the world, are formed by the rapids of the Zambezi river, the stretch following the waterfalls it is said to have the biggest concentration of grade 5 rapids in the world.