The islands in Manipur that are made of floating vegetation and silt are called Phoomdis. Phoomdis are unique floating habitats found in Loktak Lake, which is the largest freshwater lake in Northeast India and is located in the state of Manipur.

Phoomdis are formed by the accumulation of decomposed aquatic vegetation, organic matter, and soil sediments. They are held together by the interwoven roots of various plants and grasses. These floating islands can vary in size, from small patches to large landmasses. The local communities in Manipur, particularly the indigenous people known as the Loktak Manipuris, have adapted to this environment and live in houses built on these floating islands.

Phoomdis provide important ecological functions and serve as habitats for various flora and fauna, including rare and endangered species. However, they also face threats due to human activities such as pollution, encroachment, and unsustainable fishing practices. Efforts are being made to conserve the unique ecosystem of Loktak Lake and protect the Phoomdis for their ecological and cultural significance.