Achefer was one of the 105 woredas in the Amhara Region of Ethiopia. It was named for the historic district of Achefer, which was first mentioned in the 16th century. Part of the Mirab Gojjam Zone, Achefer was bordered on the south by the Agew Awi Zone, on the west by the Semien Gondar Zone, on the north by Lake Tana, on the northeast by Bahir Dar Zuria, and on the southeast by Merawi; the Lesser Abay River defined the woreda's eastern boundary. The woreda included Dek Island. The administrative center was Yesmala; other towns in Achefer included Durbete, Kunzela, Chiba and Wandege.