It is the principal stream of an endorheic drainage basin; the part that the Omo drains includes part of the western Oromia Region and the middle of the Southern Nations, Nationalities, and People's Region.
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"The rivers in Ethiopia have less capacity to hold as much water as they did years before, because they are being filled up with silt," World Food Programme spokeswoman Paulette Jones said.
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Fossil remains of Ancylotherium have been found at many of the hominid fossil sites in East and South Africa, including sites in Laetoli, Olduvai and Omo.
Chara speakers live in the Southern Nations, Nationalities, and People's Region, in the Debub Omo Zone, on both sides of the Omo river.
They live in Hamer woreda (or district), a fertile part of the Omo River valley, in the Debub Omo Zone of the Southern Nations, Nationalities, and Peoples Region (SNNPR).
Featuring an 80 meter Bailey bridge across the Omo river and five other bridges, this road cost 255 million Birr, and reduced the distance between the Regional capital at Awassa and Mizan Teferi to 400 kilometers.
Most Tsamai live in the Bena Tsemay woreda of the Debub Omo Zone of the Southern Nations, Nationalities, and People's Region, in the Lower Omo River Valley and just to the west of the Konso special woreda.
The original geographic home of the Surmic peoples is thought to be in Southwestern Ethiopia, somewhere near Maji, with the various groups dispersing from there: for example, the Majangir having moved north, the Murle having migrated clockwise around Lake Turkana (Arensen 1983:56-61, Tornay 1981), and the Mursi having moved into and out of the Omo River valley.