Most part of the sanctuary is submerged twice in a day due to high tide and is covered with dense mangrove vegetation.

The Bhola cyclone which hit the Bangladesh in 1970[3] had swept the entire human population on the island.

[2] The Mangrove species like (Sonneratia apetala),Baine (Avicennia officinalis), Geoa (Excoecaria agallocha), (Acanthus ilicifolius),Khalisha (Ageiceras maius) and Typha angustifolia are common.

[1] Common mammals include Fishing cat (Felis viverrina) and Oriental small-clawed otter (Aonyx cinerea).

The threats are encroachment for cultivation land and excessive fishing by the local people and invasion of the exotic foreign plant species.