Омо
The decreased water flow of the Omo River resulting from the Gibe III dam will have significant impacts on the ecosystems surrounding the river. The Omo River Basin is home to the only pristine riparian forest remaining in the drylands of sub-Saharan Africa. The survival of this forest is dependent upon the seasonal flooding of the Omo River, which will cease with construction of the dam. This may cause 290 km2 of forest to "dry out" from lack of water. The decreased water flow will also negatively impact, if not eliminate, all economic activities associated with the Omo River such as farming, fishing, and tourism. The water level of the Omo River is crucial for recharging groundwater supplies in the Omo basin. If the water level of the river drops once the Gibe III dam is built, then it will no longer be able to refill underground water supplies, leaving much of the basin bereft of groundwater, which negatively impacts people and ecosystems. As the water level of the Omo River drops, the erosion of its riverbanks will increase, causing increased sediment flows in the river, loss of soil for crop cultivation along the riverbanks, and loss of riparian habitats.