The Mahanadi River is a river of eastern India. The Mahanadi rises in the Satpura Range of central India, and flows east to the Bay of Bengal. The Mahanadi drains most of the state of Chhattisgarh and much of Orissa. The fertile plains of the Mahanadi valley are home to intensive rice cultivation. The Mahanadi and Brahmani rivers together form a large delta where they meet the Bay of Bengal. Tributaries of the Mahanadi include the Tel, Mand, and Hasdo rivers.