], officially Republic of the Sudan, republic (2011 est. pop. 36,740,000), 718,723 sq mi (1,861,484 sq km), NE Africa. It borders on Egypt in the north, on the Red Sea in the northeast, on Eritrea and Ethiopia in the east, on South Sudan in the south, and on the Central African Republic, Chad, and Libya in the west. Khartoum
is the capital and Omdurman
is the largest city.
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