The Nile is the longest river in Africa. It flows through three countries; Uganda, Sudan and Egypt. The main tributary, the White Nile springs from Lake Victoria in Uganda. It then flows into Lake Kyoga before heading through Sudan. Near Khartoum it is joined by the Blue Nile, the second major tributary which springs from Lake Tana in the Ethiopian Highlands. In Egypt it then flows into the Mediterranean Sea. The Nile was the lifeline of the ancient Egyptian civilization.