A delta is a landform that is formed at the mouth of a river where that river flows into an ocean, sea, estuary, lake, reservoir, flat arid area, or another river. Deltas are formed from the deposition of the sediment carried by the river as the flow leaves the mouth of the river. Over long periods of time, this deposition builds the characteristic geographic pattern of a river delta.
The Greek historian Herodotus coined the term delta for the Nile River delta because the sediment deposited at its mouth had the shape of the upper-case Greek letter Delta: Δ.
The Ganges Delta (also known as the Ganges-Brahmaputra Delta, the Sunderbans Delta, or the Bengalla Delta) is a river delta in the South Asia region of Bengal, consisting of Bangladesh and the state of West Bengal, India. It is the world's largest delta, and empties into the Bay of Bengal. It is also one of the most fertile regions in the world, thus earning the nickname The Green Delta.
Sunderbans is a World Heritage Site awarded by UNESCO in 1997 is the world’s largest delta covered by mangrove forest and vast saline mud flats. Sunderbans, the world’s largest estuarine forest is a land of 54 tiny islands, crisscrossed by innumerable tributaries of River Ganga . Sunderbans spread in an area of 9630 sq. km., where 70 percent is under saline water. Sunderbans was established as a National Park on May 4, 1984. It had earlier been designated as a Tiger Reserve in December 1973.
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