Banasura Sagar Dam is the largest earthen dam in India and the second largest in Asia and an ideal starting point for hikes into the surrounding scenic mountains. It impounds the Karamanathodu tributary of the Kabini River, is part of the Indian Banasurasagar Project consisting of a dam and a canal project started in 1979. The goal of the project is to support the Kakkayam Hydro electric power project and satisfy the demand for irrigation and drinking water in a region known to have water shortages in seasonal dry periods. The Banasura Sagar Dam is located 21 km from Kalpetta, in Wayanad District of Kerala in the Western Ghats. In the dam's reservoir there is a set of islands that were formed when the reservoir submerged the surrounding areas. The islands with the Banasura hills in the background provide a spectacular view. The dam is made up of massive stacks of stones and boulders. It is an important tourist attraction. Banasura Sagar Dam is at the foot of the Banasura Hill. The dam has become a popular tourist destination. Many people visit the place to go trekking at the Banasura Hill. The Banasura Hill Resort, located about 20 km from the dam was rated as Asia's largest Earthen Resort by BBC. Speed & pedal boats are available & are major hits with tourists. Speed boat ride, in particular, is an exhilarating experience & not to be missed. During monsoon, visitors may also be able to see small islands in the dam reservoir. They are formed while the flooded reservoir submerges the surrounding areas too. The vast expanse of the crystal clear water of the dam dotted with small islands is a photographers delight.