Kallayi River is a river flowing in the southern state of India, Kerala. The river rises in the Western Ghats of Cherikkulathur village in Kozhikode District at a height of forty-five metres. It is linked to the Chaliyar River by an artificial canal on the south side of the small timber village of Kallayi, which is situated on the bank of the river. The river flows through Cherukulathur, Kovur, Olavanna, Manava and Kallai and ultimately evacuates in the Arabian Sea at Kozhikode. The river basin is located in the Kozhikode district. The river is twenty-two kilometers in length and is spread over an area of ninety-six square kilometers. The river is commercially very significant.