Much of this sediment is derived from the river's floodplain, also called the meander belt; every time the river changed course, it would erode tons of soil and rocks from its banks.
Gran parte deste sedimento é derivado desde a chaira de inundación do río, tamén chamado o cinto meandro; cada vez que o río cambiaba de curso, erosionaría toneladas de terra e rocas das súas beiras.