Deg (also Mo, Dega, Degha, Mmfo) is a Gur (Grusi) language closely related to Vagla, and the name of the people who speak it. The Mo are listed by the Bole District Assembly among the major ethnic groups of Bole District in Gonjaland, alongside the Gonja, Vagla and Safalba.
Deg-speaking (Mo) communities live alongside Gonja and Vagla in Bole District.