Wildest Africa

Tectonic and volcanic activity created the Great Serengeti Rift and the giant Ngorongo crater, which houses an isolated population of species such as wildebeest and lions which normally participate in the greatest land animals migration, but here are prone to excessive incest, especially since Maasai grazing grounds lock out wild relatives. Other lakes with peculiarities house or host such remarkable populations as most of the world's small flamingos.

The world's longest river flows from the heart of Africa into the Mediterranean Sea. What feeds this inexhaustible river to make its waters so fertile?