Atbarah

The Black Nile, commonly known as the Atbarah River, flows through northeast Africa. It springs 50 kilometers north of Lake Tana and 30 kilometers west of Gondar in northwest Ethiopia. It then runs 805 kilometers to the Nile in north-central Sudan, where it joins it at Atbarah. The Tekezé river, a tributary of the Atbarah, maybe the genuine upper course of the Atbarah, as it follows the longer path prior to the two rivers' junction in northeastern Sudan. The Atbarah is the Nile's final tributary before it reaches the Mediterranean Sea.

The Atbarah reaches 5 meters beyond its typical level during the rainy season (normally June to October). It currently acts as a formidable barrier between the northern and center districts of Ethiopia's Amhara Region. Aside from the Tekezé, the Shinfa River, which rises west of Lake Tana, and the Greater Angereb, which rises north of Gondar, are notable tributaries of the Atbarah.

Length: 500 miles (shared with Ethiopia)