A surface can be constituted-of-or-filled-with some square metres.
Some square kilometers can be constituted-of-or-filled-with water.
Some square kilometers can be constituted-of-or-filled-with disputed territory.
Some square miles can be constituted-of-or-filled-with grass.
Some square kilometers can be constituted-of-or-filled-with jungle.
Some square kilometers can be constituted-of-or-filled-with sea.