Wikipedia
The Middle Belt is a human geographical term designating the region of central Nigeria populated largely by minority ethnic groups and stretching across the country longitudinally. The Middle Belt is indeterminate in that it lacks designated "borders" and is characterized by a heterogeneity and diversity of peoples and cultures. The eminence of manifold minority groups to some degree constitutes an ethno-linguistic barrier in the country, drawing a separation between the principally Islamic North and the mainly Christian south.
The region is a convergence of these cultural domains and maintains a tremendous degree of ethno-linguistic diversity, with languages of the Afro-Asiatic, Nilo-Saharan, and Niger–Congo families, three of the primary African language groups, all being spoken.
Usage examples of "middle belt".
The middle belt doubled as a command and control area, covering all of the spacecraft's subsystems, environmental processes, and flight operations, and as an experiment and exercise area, with a running strip around the tank's circular wall.