Sudan, in northeast Africa, is the largest country on the continent, measuring about one-fourth the size of the United States. Its neighbors are Chad and the Central African Republic on the west, Egypt and Libya on the north, Ethiopia and Eritrea on the east, and Kenya, Uganda, and Democratic Republic of the Congo on the south. The Red Sea washes about 500 mi of the eastern coast. It is traversed from north to south by the Nile, all of whose great tributaries are partly or entirely within its borders.
