Tekezé

The Tekezé or Täkkäze River, sometimes known as the Takkaze river, is a large Ethiopian river. It constitutes a stretch of Ethiopia's westernmost boundary with Eritrea for part of its journey. In Eritrea, western Ethiopia, and eastern Sudan, the river is known as the Setit. The Tekezé River is 608 kilometers long, according to Ethiopian Central Statistical Agency documents. The canyon it has carved out is the deepest in Africa and one of the deepest in the world, with depths of over 2000 meters at some spots.

From the confluence of the Tomsa with the Tekezé to the tripoint between the two countries and Sudan, the Tekezé River rises in the central Ethiopian Highlands near Mount Qachen within Lasta, where it runs west, north, and west again, marking the westernmost border of Ethiopia and Eritrea. It joins the Atbarah River, a tributary of the Nile, after entering northeastern Sudan at the tripoint. The Tekezé may be the genuine upper course of the Atbarah, given the latter takes the lengthier route before the two river's junction.

Length: 378 miles (shared with Ethiopia and Eritrea)