The Nile is the longest river in Africa and flows north through ten countries: Burundi, Rwanda, Tanzania, Uganda, Kenya, the Democratic Republic of the Congo, South Sudan, Sudan, Ethiopia, and Egypt, until it empties into the southeastern corner of the Mediterranean, forming the great Nile Delta, on which the Egyptian cities of Cairo and Alexandria are located.It is 6,650 km long, making it the second longest river in the world. For centuries it was considered the longest river; however, in 2008 measurements, it was estimated that this title corresponds to the Amazon River.It rises in Burundi and flows into the Mediterranean Sea, crossing mountains, jungles, and deserts. It has two branches or main sources: the White Nile and the Blue Nile. The former flows through the African Great Lakes, having its most distant source in Rwanda and flowing north through Tanzania, Lake Victoria, Uganda, South Sudan, and Sudan, while the Blue Nile rises in Lake Tana in Ethiopia and flows through southeastern Sudan. Both meet near the Sudanese capital, Khartoum.