The Koyna River is a tributary of the Krishna river in western Maharashtra, India. The Koyna River is famous for the Koyna Dam which is the largest hydroelectric project in Maharashtra. The reservoir — Shivaji Sagar Lake, is a huge lake of 50 km in length. The dam is situated in Koyna Nagar in the Western Ghats. The river meets the Krishna River, which is one of the three largest rivers in southern India in Karad.
The river is just about 100 meters in width and is slow-flowing. It is an olive shade of green during the dry months and a bluish-brown in the monsoon months. This is because it contains a lot of algae and aquatic plant life.
