The Awash River is a major river of Ethiopia. Its course is entirely contained within the boundaries of Ethiopia and empties into a chain of interconnected lakes that begin with Lake Gargori and end with Lake Abbe on the border with Djibouti, some 100 kilometres from the head of the Gulf of Tadjoura. The Awash River is the principal stream of an endorheic drainage basin covering parts of the Amhara, Oromia and Somali Regions, as well as the southern half of the Afar Region. The Awash River basin, spanning 23 administrative zones, covers 10% of Ethiopia's area.
The Birbir River of southwestern Ethiopia is a tributary of the Baro River, which it creates at its confluence with the Gebba. It is politically important because its course defines part of the boundary between the Mirab Welega and Illubabor Zones of the Oromia Region. Richard Pankhurst notes that the Birbir is economically important for the discovery in 1904 of deposits of platinum along its course.
The Pibor River is a river in eastern South Sudan, which defines part of South Sudan's border with Ethiopia. From its source near Pibor Post it flows north for about 320 kilometres (200 mi), joining the Baro River to form the Sobat River, which is a tributary of the White Nile.
The Akobo River is a river on the border between South Sudan and Ethiopia. From its source in the Ethiopian Highlands near Mizan Teferi it flows west for 434 kilometres (270 mi) to join the Pibor River. The Pibor flows into the Sobat River, which in turn empties into the White Nile.
The Gilo River is a river in the Gambela Region of southwestern Ethiopia. A variety of names also knows it: the Gimira of Dizu call it the "Mene", while the Gemira of Chako call it "Owis", and Amhara and Oromo settlers in the early 20th century knew it by a third name, "Bako". From its source in the Ethiopian Highlands near Mizan Teferi it flows to the west, through Lake Tata to join the Pibor River on Ethiopia's border with Sudan. The combined waters then join the Sobat River and the White Nile.
The Ganale Doria River is a perennial river in southeastern Ethiopia. Rising in the mountains east of Aleta Wendo, the Ganale flows south and east to join with the Dawa at the border with Somalia to become the Jubba. The river's tributaries include the Welmel, Weyib, and Mena. The Del Verme Falls is a notable feature of its middle course.
The Mille River is a river of Ethiopia and a tributary of the Awash. It drains parts of the Semien (North) Wollo and Debub (South) Wollo Zones of the Amhara Region, as well as Administrative Zone 4 of the Afar Region. The explorer L.M. Nesbitt, who travelled through the area in 1928, was impressed by its size, and described the Mille as "probably the only real river which joins the Awash". The Ala River (A'ura) and Golima River (Golina) are small tributaries of the Mille.
Alwero River is a river in Abobo woreda of Gambela Region, Ethiopia. It flows through the Gambela National Park and through wetlands into the Openo/Baro River.
Borkana River is a river of central Ethiopia. A left tributary of the Awash. Johann Ludwig Krapf records that it was called "Tshaffa" by the local Oromo people.
The Dembi is a river of southwestern Ethiopia, in the Debub Bench district.
The Erer is a perennial river of eastern Ethiopia. It rises near the city of Harar, in Harari Region, and flows in a primarily southern direction to its confluence with the Shabelle.
Fafen River is a river of eastern Ethiopia. Rising to the east of Harar, in Harari Region, it cuts through a series of wide, flat shelves of sedimentary rocks made of sandstone, limestone, and gypsum as it descends in a south-eastern direction towards the Shebelle River. The Fafen only joins the Shebelle river during times of heavy rainfall.
Galetti River is a river in eastern Ethiopia. It is a tributary of the Ramis River, which is in turn a tributary of the 2,714 km long Shebelle River.
Gololcha River is a river of eastern Ethiopia. It flows into the Awash River.
The Jerer is an intermittent stream of eastern Ethiopia. A tributary of the Fafen River, it rises near Jijiga to flow in a south-easterly direction.
The Logiya, or Logia, is a river of east-central Ethiopia, a left tributary of the Awash River.
The Mena is a river of eastern Ethiopia. It is located in the Delo Menna woreda in Bale Zone, Oromia Region. Its source lies in the Bale Mountains. It is a tributary of the Ganale Dorya.
The Sor is a river of southwestern Ethiopia. A tributary of the Birbir River on its left side and joins it at latitude and longitude 8°30′48″N35°11′17″E, the Sor rises in Sayo.
Weyib River is a river of eastern Ethiopia. It rises in the Bale Mountains east of Goba in the Oromia Region, flowing east to pass through the Sof Omar Caves, then to the southeast until it joins the Ganale Dorya River in the Somali Region.
The Welmel is a river of eastern Ethiopia. It is a tributary of the Ganale Dorya River, which in turn is a tributary of the Jubba River. The headwaters of the Welmel are in the Bale Mountains of the Ethiopian Highlands, and it flow southeast for 311 km (193 mi) to it's mouth.
