The Geographical Dictionary of Ancient and Mediaeval India c5.s11.46

c5.s11.46

Mahā-Kosala—Mahā Kosala comprised the whole country from the source of the Narbada at Amarakantaka on the north to the Mahānadī on the south, and from the river Wain Gaṅgā on the west to the Hasdo and Jonk rivers on the east, and it comprised also the eastern portion of the Central Provinces including the districts of Chhatisgar and Rayapur (see Tivara Deva's Inscription found at Rajim in the Asiatic Researches, XV, 508) Same as Dakshina Kosala (Cousen's Antiquarian Remains in the Central Provinces and Berar, p 59, Cunningham's Arch S Rep, vol XVII, p 68) It was the kingdom of the Kalachuris (Rapson's Indian Coins, p 33)