Pamba River

Pamba is the most important and holy spot on the way to Sannidhanam. It is here that Lord Ayyappa was found by King Rajasekara.The Pamba river is as holy as the river Ganges. The Pamba water purifies one from curse and evil. The devotees take their holy bath at the confluence of the three rivers(Triveni ). This is created by the Lord as parallel to the Ganges ( "Dakshina Ganga" )..

Periyar River

The Periyar River is the second longest river in the state of Kerala, India, with a length of 244 km. The river is also known as The lifeline of Kerala as it is one of the few perennial rivers of Kerala. It provides drinking water for major towns.

The Idukki Dam has been built across the river and generates a significant proportion of electrical power for the state. This is a concrete, double curvature parabolic, thin arc dam..