From the Wikipedia page [1]
East Welega (Amharic: Misraq Welega; Oromo: Wallagga Bahaa) is one of the zones in the central Oromia Region of Ethiopia. This administrative division acquired its name from the former province of Welega. Towns and cities in this zone include Nekemte.
East Welega is bounded on the southwest by Illubabor, on the west by the Didessa River which separates it from West Welega, on the northwest and north by the Benishangul-Gumuz Region, on the northeast by Horo Guduru Welega Zone, on the east by West Shewa, and on the southeast by the Gibe River which separates it from Jimma. The highest point in this zone is Mount Garochan (3,276 m).