Abay Chomen is one of the woredas in the Oromia Region of Ethiopia. Part of the Horo Gudru Welega Zone, Abay Chomen is bordered on the south by Lake Finicha'a (created when Finicha'a Dam flooded the Chomen swamp), on the southwest by Jimma Horo, on the northwest by Amuru Jarte, on the north by the Abay River which separates it from the Amhara Region, and on the east and south by Guduru.