Омо
The Gibe River (also Great Gibe River) is by far the largest tributary of the Omo River in Ethiopia and typically flowing south-southeast. The confluence of the large Gibe River at with the smaller Wabe River forms the even larger Omo River. Consequently, the whole drainage basin is sometimes called the "Omo-Gibe River Basin" with the Gibe and the Omo draining the upper and lower reaches, respectively.