nila river

The headwaters of main tributary of Bharathappuzha originates in the Anaimalai Hills in the Western Ghats, and flows westward through Palakkad Gap, across Palakkad, Thrissur and Malappuram districts of Kerala, with many tributaries joining it, including the Tirur River. For the first 40 km or so, the Bharathappuzha follows an almost northerly course till Pollachi. At Parli both Kannadippuzha and Kalpathippuza merge and flow as Bharathappuzha and follows a westerly course until it empties into the Arabian Sea at Ponnani. Thootha River merges with Nila at Pallippuram. As Thootha river is rich in water, after its merger, Nila becomes thicker in flow.