The Nile River has had five stages in its evolution, with the first being the Eonile that formed approximately 5 million years ago, coinciding with the drying up of the Mediterranean Sea during the Miocene period. The other stages of its evolution are the Paleonile, Protonile, Prenile and Neonile.
The Nile is considered the world's longest river and flows through 11 countries. The Nile consists of the Blue Nile and White Nile, with the White serving as the headwaters for the river. The Blue Nile is the primary source of fertile soil and water for the river. The two tributaries meet near Khartoum, and the end of the Nile forms a large river delta that flows into the Mediterranean Sea.