Phumdis are a series of floating islands, exclusive to the Loktak Lake in Manipur state, in northeastern India. They cover a substantial part of the lake area and are heterogeneous masses of vegetation, soil and organic matter, in different stages of decay. The largest single mass of phumdi is in the southeastern part of the lake, covering an area of . This mass constitutes the world’s largest floating park, named Keibul Lamjao National Park. The park was formed to preserve the endangered  Eld's deer subspecies, called sangai in the Manipuri language, indigenous to this area.