It rises in the mountains of Guma, flowing in almost a direct line its confluence with the Omo at
Its canyon provided the former Kingdom of Kaffa an important defensive frontier, as described by Mohammed Hassan: The hot valley of the Gojeb, infested with both terrible mosquitos and tsetse flies, covered with tall grass and dense forest, made rapid cavalry attack and retreat virtually impossible.
This natural protection ... was further strengthened by elaborate and highly complex man-made fortifications which protected all the entrances to that country.Because of its location between the two kingdoms, Alexander Bulatovich, who crossed the river in January 1897, reported its valley was uninhabited, yet "abounds in wild goats and antelopes.
Larger animals, such as elephants and rhinoceroses, stay lower on the river's course, near to where the Gojeb flows into the Omo.
The project was developed by Mohammed International Development Research Organization and Companies (MIDROC), which intends to sell the output to the Ethiopian Electric Power Corporation.