Triangular area of marshland formed by deposits of silt at the mouth or some rivers?

Delta

Explanation:

Delta is a triangular region where rivers divide into small streams and then progresses to drain into a big river. Such regions possess rich alluvial and mineral soil deposits. It is the part of an old age river.

For example - the largest delta of the world is the  Ganges Bhramaputra delta

cd's

explanation:

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