Sudan (Arabic: السودان‎ as-Sūdān /suˈdaːn/), officially the Republic of the Sudan (Arabic: جمهورية السودان‎ Jumhūrīyat as-Sūdān), is an Arab republic in the Nile Valley of North Africa, bordered by Egypt to the north, the Red Sea, Eritrea and Ethiopia to the east, South Sudan to the south, the Central African Republic to the southwest, Chad to the west and Libya to the northwest. It is the third largest country in Africa. The Nile River divides the country into eastern and western halves.