On which river is the Koyna Dam, one of Maharashtra's largest dams, constructed?

Q. On which river is the Koyna Dam, one of Maharashtra's largest dams, constructed?
Answer: Koyna River
Notes: Koyna Dam is built on the Koyna River, a tributary of the Krishna River, in Maharashtra. It serves both irrigation and hydroelectric needs and is located in the biodiverse Western Ghats, a UNESCO World Heritage Site.