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Sudan, officially the Republic of Sudan, is a country in northeastern Africa. It is the largest country in Africa and the Arab world, and tenth largest in the world by area. It is bordered by Egypt to the north, the Red Sea to the northeast, Eritrea and Ethiopia to the east, Kenya and Uganda to the southeast, the Democratic Republic of the Congo and the Central African Republic to the southwest, Chad to the west and Libya to the northwest.

The world's longst river, the Nile, is the dominant geographic feature of Sudan, flowing 3,000 kilometers from Uganda in the south to Egypt in the north. Most of the country lies within its catchment basin. The Blue Nile and the White Nile, originating in the Ethiopian highlands and the Central African lakes, respectively, join at Khartoum to form the Nile River proper that flows to Egypt. Other major tributaries of the Nile are the Bahr el Ghazal, Sobat, and Atbarah rivers.

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