The other principal rivers in Bengal are the Sone, Gogra, Gandak, Kusi, Tista; the Hugh, formed by the junction of the Bhagirathi and Jalangi, and farther to the west, the Damodar and Rupnarayan; and in the south-west, the Mahanadi or great river of Orissa.
The principal hills are - (1) the Maikal range, situated in the north-western extremity of the district; (2) a chain of hills forming part of the Vindhyan range, on the north; (3) the Korba hills, an off-shoot of the Vindhyas, on the eastern boundary; and (4) the Sonakhan block of hills, in the vicinity of the Mahanadi river.
The Mahanadi is the principal river of the district, and governs the whole drainage and river system of the surrounding country.
The eastern part of the Nagpur country and the Chhattisgarh plain, comprising the Mahanadi basin, form the great rice tract of the province, its heavy rainfall and hard yellowish soil rendering it excellently adapted for the growth of this crop.
The middle and eastern divisions of the district, forming the south-western part of the Mahanadi delta, consist entirely of alluvial plains, watered by a network of channels through which the most southerly branch of that river, the Koyakhai, finds its way into the sea.