The River Nile runs for 4199 miles (6758 KM) from its source in Rwanda to Alexandria, Egypt, to the Mediterranean. Including the Blue Nile, it flows through ten countries (Rwanda, Uganda, Congo, Kenya, Tanzania, Burundi, Eritrea, South Sudan, Sudan).
From highland jungle to desert, it is home to the Nile Crocodile, soft shelled turtles, poisonous snakes, hippos, a variety of fish (Nile Perch can weigh up to 175 pounds, tigerfish, lungfish, catfish, mudfish and eel).
It is habitat to many, many species of birds.
Important civilizations have come and gone along its route. Its route(s) have changed over many years, many times, and still today, it is the essential environmental factor wherever it flows.