The Achankovil River is known as Achankovilaru in vernacular. The river is also known as Kulallada River. This Indian River is formed when several small streams namely Rishimala River, Pasukidametttu River and the Ramakkalteri River meet together in eastern Kerala. It is a small river not more than 130 kilometers. It passes through Cheriyanad, Puliyoor and Chengannur villages, enters Mavelikkara Taluk at Chennithala, It then flows through Thriperumthura and Pallippad villages.

The river ultimately joins the Pamba River at Veeyapuram, which is in the Alappuzha district of Kerela. On the banks of the Achankovil River, is the holy town of Pandalam, which is associated with Lord Ayyappa. The Achankovil Dam is built on this river