The Gilo River (also transliterated as Gelo) is a river in the Gambela Region of southwestern Ethiopia. It is also known by a variety of names: the Gimira of Dizu call it the "Mene", while the Gemira of Chako call it "Owis", and Amhara and Oromo settlers in the early 20th century knew it by a third name, "Bako". From its source in the Ethiopian Highlands near Mizan Teferi it flows to the west, through Lake Tata to join the Pibor River on Ethiopia's border with Sudan.