Kamashi is one of the three Zones in the Benishangul-Gumuz Region of Ethiopia. It covers part of the southern bank of the Abay and the valley of the Didessa Rivers. The Zone is bordered on the south and east by the Oromia Region, on the west by the Asosa and Sudan, and on the north by Metekel and the Amhara Region, which lie on the further bank of the Abay.