Sundarban Biosphere Reserve (SBR) is the largest delta - mangrove forest in the world inhabited by 'Royal Bengal Tiger' and has also been inscribed as the 'World Heritage Site' in 1987. Both national and international tourists from all over the globe visit Sundarban though in limited number. The society of Sundarban is founded upon Hindu-Muslim unity and a blend of Hindu and Muslim-culture is observed in the region.