The Tekezé River is a major river of Ethiopia, and forms a section the westernmost border of Ethiopia and Eritrea for part of its course. The river is also known as the Setit in western Ethiopia and eastern Sudan.
The Tekezé River rises in the central highlands of Ethiopia near Mount Qachen , from where it flows west, north, then west again, forming the westernmost border of Ethiopia and Eritrea. It continues into northeastern Sudan, where at 14° 10' N., 36° E., the Tekezé joins the Atbarah River, the lower course of which is a tributary of the Nile. The Tekezé is perhaps the true upper course of the Atbarah, as the former follows the longer course prior to the confluence of the two rivers.
The names of its main tributaries in Ethiopia from its source are: on the right bank Tahali, Meri, Sellare, Sullo, Arecua, Gheoa, War'e, Firafira, Tocoro and Gumalo Rivers; on the left bank Nili, Menna, Balasa, Balagas, Saha, Bembea, Ataba, Zarema, and Kwalema Rivers.
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