Which geographical feature is created by sediment deposition at a river's ending point?

A delta is formed when a river reaches its ending point, typically where it meets a larger body of water like an ocean, sea, or lake. As the river flows, it carries sediment—such as sand, silt, and clay—picked up from the land. When the river's flow slows down upon reaching the standing water, it can no longer carry all of this sediment, causing it to settle and accumulate at the river's mouth. Over time, this process leads to the formation of a delta, which is characterized by a fan-shaped or triangular landform that can be rich in nutrients and serve as important ecosystems.

In contrast, a swamp is typically wetlands characterized by the presence of trees or shrubs, and it develops from different ecological processes rather than sediment deposition at a river's end. A lake is a large water body enclosed by land; though sediment can contribute to the formation of a lake in some cases, it is not the defining feature of lakes as it is with deltas. An island is a landmass surrounded by water and can be formed through various means, including volcanic activity or rising sea levels, rather than specifically by river sediment deposition. Thus, the process of sediment deposition at the river's ending point uniquely leads to the