This was taken from Wikipedia The Omo is an important river of southern Ethiopia. Its most important tributary is the Gibe River; smaller tributaries include the Wabi, Mago and Gojeb Rivers. This river rises in the Shoan highlands and is a perennial river with many affluents. According to the Statistical Abstract of Ethiopia for 1967/68, the Omo River is 760 kilometers long. In its course it has a total fall of about 6000 ft (2,000 m), from an elevation of 7600 ft at its source to 1600 ft at lake-level, and is consequently a very rapid stream, being broken by the Kokobi and other falls, and navigable only for a short distance above where it empties into Lake Turkana, one of the lakes of the Great Rift Valley. The Omo River formed the eastern boundaries for the former kingdoms of Janjero, and Garo. The Omo also flows past the Mago and Omo National Parks, which are known for their wildlife. The Omo river basin is important geologically and archaeologically. Several hominid fossils and archaeological locatities, dating to the Pliocene and Pleistocene, have been excavated by French and American teams. Fossils belonging to the genera Australopithecine and Homo have been found at several archaeological sites, as well as tools made from quartzite, the oldest of which date back to about 2.4 million years ago. When they were discovered it was thought that the tools may have been part of a so-called pre-Oldowan industry, even more primitive than what was found in the Oldupai Gorge. Later research has shown that the crude looks of the tools were in fact caused by very poor raw materials, and that the techniques used and the shapes permit their inclusion in the Oldowan.