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River deltas are landforms that form at the mouth of a river, where the river meets a body of water such as a sea or ocean. They are typically triangular or fan-shaped, with sediment carried by the river being deposited at the delta and building up over time. Deltas are often characterized by a network of distributaries, or smaller channels, through which the river water flows and spreads out into the surrounding body of water. Deltas are dynamic and constantly changing due to the shifting nature of sediment deposition and erosion processes. They are important ecosystems that support a diverse range of plant and animal species.