Banasura Dam – The Largest Earth Dam dams wayanad by Kerala Photos - January 26, 2018 Banasura Dam is the largest earth dam in India and the second largest in Asia built across Karamanathodu river, a tributary of the Kabini River. It was built in 1979 as a part of Banasurasagar project. The main motive behind this dam project was to help the public during the dry