it is caled a delta
An alluvial plain, sometimes also referred to as a fluvial plain.
A delta is formed at the mouth of a river where sediment is deposited, creating a fan-shaped landform. A floodplain, on the other hand, is the flat area around a river that is covered in water during times of flooding. Essentially, a floodplain is an area that can be part of a delta but not all deltas have floodplains.
Alluvial plain or delta
A deltaic plain is a low-lying landform that forms at the mouth of a river where sediment is deposited as it flows into a body of water, such as a lake or ocean. These areas are typically very fertile and support diverse ecosystems due to the rich soil deposits brought by the river. Deltaic plains are often characterized by their triangular shape and extensive network of distributaries.
well-watered northern plain, the dry triangular plain, and the coastal plain
The land formed by silt deposited at the mouth of a river is called a delta (named for the Greek letter, which is similarly triangular in shape).Delta1. Flood plain 2. Levees 3. Ox-bow lake 4. Delta.
The flood plain. Delta
A plain formed at the mouth of a river is called a delta. It is created by the accumulation of sediment that the river carries as it flows into a larger body of water, such as an ocean or lake. As the river slows down upon entering the still water, it loses its capacity to transport sediment, leading to the deposition of materials like sand, silt, and clay. This sedimentary deposit gradually builds up over time, creating a fertile and often ecologically rich area.
Northern plain, triangular plain, coastal plane
The abyssal plain is the flattest place on Earth because it lies under a layer of sediment 500 to 1000m (about 1600 to 3300 ft) thick. The sediment has made the abyssal plain the flattest place on Earth.
At the mouth of a submarine canyon, you would expect to find a submarine fan. This is a large accumulation of sediment that has been transported down the canyon and deposited on the ocean floor as the canyon widens and reaches the abyssal plain.
A plain snaffle or a happy mouth.