Loktak is the largest freshwater lake in Northeast India famous for the floating islands made of decomposing vegetable matter. The name Loktakmeans Lok = "stream" and tak = "the end". The largest of the entire island covers an area of 40 km2 and is situated on the southeastern shore of the lake. Located on this island is Keibul Lamjao National Park is the only floating national park in the world. The park is the last natural refuge of the endangered Sangai or Manipur brown-antlered deer one of three subspecies of Eld's deer. Loktak Day is observed every year on the 15th of October at the periphery of the Loktak lake.