The Sundarbans HomeitemsIMAGES The Sundarbans, a UNESCO World Heritage Site and a wildlife sanctuary. The largest littoral mangrove forest in the world, it covers an area of 38,500 sq km, about a third of which is covered in water. Sundarbans, Khulna, Bangladesh. December 2010. Total: $0.00 Download Save to LightboxThis item was saved to your lightbox.