The Biu–Mandara or Central Chadic languages of the Afro-Asiatic family are spoken in Nigeria, Chad and Cameroon.

Adamawa State is a state in the North-East geopolitical zone of Nigeria, bordered by Borno to the northwest, Gombe to the west for 95 km, and Taraba to the southwest for about 366 km, while its eastern border forms part of the national border with Cameroon across the Atlantica Mountains for about 712 km. It takes its name from the historic emirate of Adamawa, with the emirate's old capital of Yola, serving as the capital city of Adamawa state. The state is one of the most heterogeneous in Nigeria, with over 100 indigenous ethnic groups. It was formed in 1991, when the former Gongola state was divided into Adamawa and Taraba states. Since it was carved out of the old Gongola State in 1991 by the General Ibrahim Badamsi Babangida military regime, Adamawa State has had 10 men, both military and civilian, controlling the levers of power, who played crucial roles in transforming the state into what it is today.