Which of the following National Parks is unique in being a swamp with floating vegetation that supports a rich biodiversity?
- ABhitarkanika National Park
- BKeibul Lamjao National ParkCorrect
- CKeoladeo Ghana National Park
- DSultanpur National Park
Explanation
Keibul Lamjao National Park is located in the Bishnupur district of Manipur, India, and is the world's only floating national park. It is unique due to the presence of 'phumdis', which are heterogeneous masses of vegetation, soil, and organic matter in various stages of decomposition, floating on the surface of Loktak Lake. These phumdis support a rich biodiversity, including the endangered Sangai (brow-antlered deer), which is endemic to this floating habitat. The other national parks mentioned do not have this unique characteristic of floating vegetation.

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