Correct answer: Maharashtra
The Koyna Dam is built across the Koyna River in the Satara district of Maharashtra.
It is one of the largest dams in Maharashtra and a major source of hydroelectric power for the state.
The dam created the large Shivsagar Lake as its reservoir.
This region lies in an area that has recorded notable seismic activity, and the dam is often mentioned in discussions about reservoir induced earthquakes.
The Koyna Hydroelectric Project supplies power to large parts of Maharashtra and nearby regions.
Because of its size and importance, the Koyna Dam is a frequently asked topic in general knowledge exams about Indian dams.