The Loktak Hydroelectric Project is a major source of power in Manipur and is located on the:

The correct answer is: Manipur River.

The Loktak Hydroelectric Project is a major source of power in Manipur and is located on the Manipur River. The project was commissioned in 1974 and has a capacity of 105 MW. The project has been criticized for its environmental impact, including the displacement of people and the destruction of wetlands.

The Imphal River is a tributary of the Manipur River. The Barak River is a major river in northeastern India. The Yu River is a tributary of the Barak River.