The Pamba originates at Pulachimalai hill in the Peerumedu plateau in the Western Ghats at an altitude of and flows through Chittar, Vadasserikkara, Ranni, Ayroor, Cherukole, Keezhukara, Kozhencherry, Maramon, Aranmula, Arattupuzha, Edanad, Puthencavu, Chengannur, Kallissery, Pandanad, Parumala, Mannar, Kadapra, Melpadom, Thevery, Veeyapuram, Thakazhy, Pullangady, Pallathuruthy before emptying into the Vembanad Lake, while another branch flows directly via Karuvatta into Thottappally Spillway. The river enriches the Pathanamthitta, Alappuzha districts of Kerala state. Kuttanad, an important rice cultivation area in Kerala receives its irrigation water from the Pamba river. The Pamba basin is bounded on the east by the Western Ghats. The river shares its northern boundary with the Manimala River basin, while it shares the southern boundary with the Achankovil River basin. One branch of Pamba called Varattar flows from Arattupuzha/Puthenkavu and along Edanad, Othera, Thiruvanvandoor, Eramallikkara and flows into Manimala River at Kallumkal East side. Another branch of Pamba flows from Kuthiathode and joins with Manimala River at Kallumkal West side, and branches out again at Nedumpuram from Manimala River and flows along Thalavady, Edathua, Champakulam, Pullangady, Nedumudy and empties into Vembanad Lake at Kainakary. This branch links with Mainstream Pamba River at Pullangady while continuing to flow to Vembanad lake. One branch of Achankovil River joins with Pamba at Paippad/Veeyapuram, while another branch flows into Pamba again via Karichal, Cheruthana. Perunthenaruvi is the major waterfall in Pamba river between vechoochira and Athikkayam