Question

what is delta name one delta

Answer 1

A river delta is a landform that forms from deposition of sediment carried by a river as the flow leaves its mouth and enters slower-moving or stagnant water.This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or (more rarely) another river that cannot transport away the supplied sediment. 
e.g. The Ganges/Brahmaputra combination delta, which spans most of Bangladesh and empties into the Bay of Bengal, is the world's largest delta.

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Answer 2

 an area of low, flat land, sometimes shaped like a triangle, where a river divides into several smaller rivers before flowing into the sea.
an example is Sunderban delta