The Banasura Sagar Dam is located in the Wayanad district of Kerala, India. It is the largest earthen dam in India and was constructed in 1979. The dam is built across the Banasura River, a tributary of the Kabini River, and serves primarily for irrigation and water supply. Surrounded by lush green hills, the dam is a popular tourist destination, offering scenic views and opportunities for boating. The reservoir created by the dam is also home to various species of flora and fauna, making it an important ecological site in the region.