A (floor area) can be constituted-of-or-filled-with some square metres.
A territory can be constituted-of-or-filled-with some square kilometers.
An island can be constituted-of-or-filled-with some square miles.
Some square feet can be constituted-of-or-filled-with (lab space).
A (surface area) can be constituted-of-or-filled-with some square meters.