(1) A Commonwealth reserve includes:
(a) land or seabed to the depth stated in the Proclamation declaring the Commonwealth reserve; and
(b) the waters and seabed under any sea in the area declared as a Commonwealth reserve.
(2) In this Act:
"land" includes subsoil of land and any body of water (whether flowing or not) except the sea.
"seabed" includes:
(a) the surface of a coral formation; and
(b) subsoil of seabed (including coral beneath the surface of a coral formation).