What natural feature is formed as a result of sediment deposition at the mouth of a river?

A delta is formed at the mouth of a river due to the accumulation of sediment that is transported downstream by the river's flow. As the river reaches its mouth and enters a standing body of water, like an ocean, lake, or sea, its velocity decreases significantly. This reduction in speed causes the river to deposit the sediment it has carried, creating landforms known as deltas.

Deltas typically have a triangular or fan shape and are characterized by fertile soil, which makes them ideal for agriculture. The deposition of sediment can lead to the formation of various habitats, including wetlands and marshes, supporting diverse ecosystems. The ongoing sediment deposition and shifting of river channels can also cause changes in the delta's shape and size over time. Overall, the formation of a delta is a direct consequence of the dynamic processes of sediment transport and deposition influenced by the river's flow and interaction with standing water bodies.