Plains
A plain is a wide area of flat or gently rolling land. Plains cover more than one-third of the world's land area. They exist on every continent.
Plateau.
its a streem
its a streem
landscape
Mud Slide
planes
A plain or Grassland
This is fairly close to the definition of a "coastal plain."
I think you mean a plateau. Plateau: expanse of raised land with a level surface. Also known as tableland, do to the flat tops.
It would be the flood plain or meander belt.