The embankments on a river bank that help to contain and direct the water are called different things, depending on where you live.
They can be called levées, dikes, stopbanks, floodbanks or sometimes just embankments.
delta
Embankments are built along the banks of rivers primarily to control flooding by containing the water within the river's channel during periods of heavy rainfall or snowmelt. They help protect adjacent land, infrastructure, and communities from flood damage. Additionally, embankments can also be used to manage river navigation, reduce erosion, and improve land use by creating stable areas for agriculture or development.
The "Main Channel".
A levee is a buildup of sediment deposited along the channel of a river that keeps the river inside its banks. It acts as a natural barrier that prevents the river from overflowing and causing flooding in surrounding areas.
Levee
Levees. They are natural or man-made raised embankments along a river or other body of water that help prevent flooding by containing the flow within the main channel.
A levee or embankment are two names of flood defences used to keep flood water in the river channel.
The River Channel is just before the the river meets the mouth or sea.
banks
When sediment is deposited outside the banks of a river, it forms landforms known as levees. Levees are elevated embankments that help to prevent flooding by containing the river within its channel. They are created through the accumulation of sediments carried by the river during times of high flow.
Long ridges of sediments alongside the channel of a river are called levees. They are created by the deposits which are made when a river overflows its banks.
The large body of water that flows in between England and France is called the English channel. It is not a river.