The Sundarban National Park (Bengali: সুন্দরবন জাতীয় উদ্যান Shundorbôn Jatiyo Udyan) is a National Park, Tiger Reserve, and a Biosphere Reserve in West Bengal, India. It is part of the Sundarbans on the Ganges Delta, and adjacent to the Sundarban Reserve Forest in Bangladesh. The delta is densely covered by mangrove forests, and is one of the largest reserves for the Bengal tiger. It is also home to a variety of bird, reptile and invertebrate species, including the salt-water crocodile. The present Sundarban National Park was declared as the core area of Sundarban Tiger Reserve in 1973 and a wildlife sanctuary in 1977. On 4 May 1984 it was declared a National Park. It is a UNESCO world heritage site inscripted in 1987.  It is considered as a World Network of Biosphere Reserve (Man and Biosphere Reserve) in 2001.