Section 2(49)(a) in The M.P. General Clauses Act, 1957
(a)"Mahakoshal region" means the territories comprised immediately before the appointed day within the districts of Jabalpur, Sagar, Damoh, Mandla, Hoshangabad, Narsimhapur, Chhindwara, Seoni, Betul, Nimar, Raipur, Bilaspur, Durg, Bastar, Sarguja, Raigarh and Balaghat;