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You might be referring to a "delta." The delta is where a river empties into a body of water, typically the ocean or sea. The delta gets its name from the shape created by the branches of the river that spread out in a triangular form where they meet the larger body of water, as the Greek symbol for delta is a triangle. River deltas are notoriously fertile areas as the river's current transports many minerals downstream and deposits them in the soil in the area of the delta, this mineral rich soil is referred to as "silt." The fertility of river deltas made them popular areas for settlement by early civilizations.

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17y ago

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