Overview

The Sundarbans is the largest contiguous block of tidal, salt-tolerant mangrove forest on Earth. This vast mangrove landscape occupies the lower reaches of the Ganges–Brahmaputra–Meghna delta, straddling southwestern Bangladesh and the Indian state of West Bengal. Much of the Bangladeshi portion lies within Khulna Division, an administrative area often cited in regional descriptions (Khulna Division). The region includes protected units such as the Sundarbans National Park in India and several conservation zones designated as a UNESCO World Heritage Site.

Environment and characteristics

The Sundarbans occupies the dynamic Sundarbans delta, a network of tidal channels, mudflats and islands that are inundated by salt and fresh water in changing seasons. Soils, hydrology and regular tidal flooding favor halophytic (salt-adapted) vegetation and a mosaic of habitats. Dominant trees include the sundari (Heritiera fomes) and other salt-tolerant species typical of mangrove forests. These plants trap sediment and build land while providing nursery grounds for fish and crustaceans.

Wildlife and conservation

The Sundarbans supports a high diversity of fauna, including estuarine crocodiles, several deer and monkey species, and abundant birdlife. It is internationally notable as a refuge for the Bengal tiger, one of the region's top predators; some protected areas in India are formally managed as tiger reserves and biosphere reserves (biosphere reserve). Conservation efforts combine habitat protection, anti-poaching patrols and research on human–wildlife interactions to reduce conflict and preserve genetic and ecological values.

Human communities and threats

Thousands of people live in and around the Sundarbans, relying on fishing, honey and timber for livelihoods. Traditional uses coexist with concerns about safety, as tiger encounters and occasional cyclones make settlement hazardous. Major threats include habitat loss from upstream river changes and land conversion, increasing salinity, accelerated sea-level rise and more intense storms linked to climate change. These pressures complicate conservation and increase vulnerability for coastal communities.

Importance and management

The Sundarbans provides critical ecosystem services: it buffers storms, reduces coastal erosion, supports fisheries and stores carbon. Management is multi-jurisdictional and includes protected areas like Sundarbans National Park, national and regional policy actions, community-based initiatives and international recognition aimed at sustainable use. Key facts:

  • Natural barrier: reduces cyclone impact and protects inland settlements.
  • Biodiversity: unique assemblage of mangrove species and wildlife, including the Bengal tiger.
  • Transboundary conservation involves Bangladesh and India working across the delta and administrative units such as Khulna Division.
  • Scientific and cultural value: recognized by UNESCO and managed through biosphere and reserve frameworks (biosphere reserve, park).

Ongoing research and sustainable development efforts aim to balance local needs with long-term protection of this globally significant mangrove ecosystem.