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How does the Sundarbans region relate to the Ganges delta?

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Physical map showing the Brahmaputra and Ganges river basins and their drainage networks across northern India, Bangladesh, Nepal, Bhutan, Tibet (China), and Myanmar. The map uses color shading to indicate elevation, from the high Himalayas in brown and white to lowland plains in green, and marks major rivers, tributaries, glaciers, dams, irrigated areas, and regions subject to flooding. An inset locator map highlights the region within South Asia. — Ganges River The Brahmaputra and Ganges river basins and their drainage network.

The Sundarbans region constitutes the lower, seaward portion of the Ganges-Brahmaputra delta. Located along the Bay of Bengal, this vast tract of forest and saltwater swamp serves as the delta's southern boundary.21

The relationship between the two is defined by the following characteristics:

Geographic Position: The Sundarbans extends approximately 160 miles west-east across the delta, stretching from the Hugli River estuary in India to the Meghna River estuary in Bangladesh.2
Formation: The landscape is shaped by the delta's active processes, including the deposition of enormous loads of silt and sediment carried by the river system, as well as the erosional forces of the sea and wind.21
Environment: As the delta transitions toward the coast, it forms a low-lying, marshy environment characterized by a network of tidal rivers, creeks, and channels that enclose densely forested islands. This region is renowned for its mangrove forests and serves as a vital refuge for diverse wildlife, including Bengal tigers.2

Both India and Bangladesh protect their respective portions of this deltaic region as UNESCO World Heritage sites.21