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The Atbarah River (; transliterated: Nahr 'Atbarah), also referred to as the Red Nile and / or Black Nile, is a river in northeast Africa. It rises in northwest Ethiopia, approximately 50 km north of Lake Tana and 30 km west of Gondar. It then flows about 805 km (500 mi) to the Nile in north-central Sudan, joining it at the city of Atbarah (). The river's tributary, the Tekezé (Setit) River, is perhaps the true upper course of the Atbarah, as the Tekezé follows the longer course prior to the confluence of the two rivers (at 14° 10' N, 36° E) in northeastern Sudan. The Atbarah is the last tributary of the Nile before it reaches the Mediterranean.
For much of the year, it is little more than a stream. However, during the rainy season (generally July to October), the Atbarah rises some 18 ft (5 m) above its normal level. At this time, it forms a formidable barrier between the northern and central districts of the Amhara Region of Ethiopia. Besides the Tekezé, other important tributaries of the Atbarah include the Shinfa River which rises west of Lake Tana, and the Greater Angereb which has its source north of the city of Gondar.
In April 1898 a major battle was fought beside the river during the Anglo-Egyptian invasion of Sudan 1896–1899 between Mahdist Sudan forces and an Anglo-Egyptian Army under the command of Lord Kitchener, which resulted in the destruction of the 20,000-strong Mahdist detachment. In 1964, the river was dammed by the Khashm el-Girba Dam near Kassala in Sudan to provide irrigation to the newly built town of Halfa Dughaym in an otherwise fairly arid region and to resettle the Sudanese population driven away by the Aswan High Dam (Sad al-Aali) in Egypt, which flooded 500 km of the Nile Valley in southern Egypt and northern Sudan.
Construction on a $1.9 billion twin dam project about 20 km upstream from the confluence of the Upper Atbara and Setit rivers, the Rumela and Burdana dams, began in 2011 and was inaugurated by President Omar al-Bashir in February 2017.
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