A plateau is a flat, elevated landform that rises sharply above the surrounding area on at least one side. Plateaus occur on every continent and take up a third of the Earths land. They are one of the four major landforms, along with mountains, plains, and hills.
Island, this is a landform surrounded on all sides by water (kasatochi island) It isnt a plateau because a plateau is touching land on one of 4 sides. hope this helps:)