The Sundarbans is a natural region in the Bengal region comprising Eastern India and Bangladesh. It is the largest single block of tidal halophytic mangrove forest in the world.The Sundarbans covers approximately 10,000 square kilometres (3,900 sq mi) of which 60 percent is in Bangladesh with the remainder in India. The Sundarbans is a UNESCO World Heritage Site.
The Sundarbans National Park is a National Park, Tiger Reserve, and a Biosphere Reserve located in the Sundarbans delta in the Indian state of West Bengal. Sundarbans South, East and West are three protected forests in Bangladesh. This region is densely covered by mangrove forests, and is the largest reserves for the Bengal tiger.