the world > space > relative position > condition of being external > enclosing or enclosure > enclose [verb (transitive)] > with a mound or mounds (3)
transitive. To shut up or out as with a rampart. Obsolete. rare.
transitive. To enclose, bound, or fortify with a bank, embankment, etc. Also figurative. Now rare.
transitive. To surround or enclose with a mound or mounds.