Hamer includes part of Lake Chew Bahir along its southeastern border. The administrative center is Dimeka; other towns include Turmi. Hamer was part of former Hamer Bena woreda.
Lake Chew Bahir forms a boundary for Hamer, with Dimeka serving as its administrative center. Other towns within Hamer include Turmi.  Historically, Hamer belonged to the Hamer Bena woreda.