Ken has an overall drainage basin of 28,058 km 2 , out of which 12,620 km 2 belong to Sonar River its largest tributary, whose entire basin lies in Madhya Pradesh; and along its 427 kilometers course it receives water from its own tributaries such as Bawas, Dewar, Kaith and Baink on the left bank, and Kopra and Bearma of the right.