World Asia 5 min read Eight photos: 'Tiger widows’ are restoring the world’s largest mangrove forest 8 photos The Sundarbans is the world’s largest mangrove forest. It is a network of tidal waterways, mudflats and islands, spanning the coastline between West Bengal, in India, and Bangladesh. Click on the photo to see more. Conservation International Eight photos: 'Tiger widows’ are restoring the world’s largest mangrove forest The Sundarbans is the world’s largest mangrove forest.