Yaso is one of the 21 woredas in the Benishangul-Gumaz Region of Ethiopia. Part of the Kamashi Zone, Yaso is bordered by the Abay River on the north which separates it from Wenbera, Bulen, Dibate and the Amhara Region, by the Oromia Region in the southeast, by Belo Jegonfoy in the south, and by the Didessa River on the west which separates it from Kamashi and Agalo Mite.