The Sundarbans National Park is a national park in the state of West Bengal , India . Is completed in the park adjoining Sundarbans in Bangladesh . The Sundarbans, located in the delta of the river Ganges , is covered with a dense forest of mangroves , and is one of the most extensive reserves of the Bengal tiger ( Panthera tigris tigris ). It also houses a large number of species of birds , of reptiles , such as marine crocodile ( Crocodylus porosus ), as well as invertebrates .
It was declared a World Heritage Site by Unesco in the year 1987 , covering a protected area of 133,010 has .