Bangladesh has one of the most biologically resourceful and unique forests known as the Sundarbans. The Sundarbans is the largest mangrove forest in the world. Mangrove forest have a unique combination of terrestrial and aquatic ecosystems. The mangrove forests serve as a natural fence against cyclonic storms and tidal surges. Stabilize coastlines, enhance land accretion , and enrich soil near the aquatic environment. The Sundarbans Reserve Forest occupies an area of 601.700 hectares of which 406.900 ha forests. 187.400 ha water (rivers, rivulets, ponds, and canals), 30.100 ha form wildlife sanctuaries, and 4200 hectares are sand bar.
It is home to several uniquely adapted flora and fauna, and provides feeding and nursery grounds for many animals. Many animals spend their entire life in the mangroves, whilst others spend some part of it.