Water is a vital element of Mahasamund's geography, feeding its extensive agricultural lands.
* **Mahanadi River:** One of the major rivers of East-Central India, the Mahanadi forms the geographical backbone of the wider district. It is central to the area's irrigation and holds great cultural and historical significance, particularly at the Sirpur heritage site. * **Kodar River:** A tributary that has been dammed to create the Kodar Reservoir, providing irrigation, local fishing opportunities, and eco-tourism. * **Jonk River:** Another significant river flowing through the district, enriching the local wetlands and forest borders.