A circular embanked enclosure, roughly twenty metres across, appears clearly on the Ordnance Survey six-inch map of 1838, drawn with the careful ink lines of the first great systematic mapping of Ireland. By the time later map editions were produced, it had vanished from the cartographic record entirely. At ground level today, there is nothing to see at all.

The enclosure belongs to a category of earthwork common across Ireland, a roughly circular area defined by a raised bank, of the kind that might have served as a farmstead enclosure, a ritual site, or a boundary feature depending on its age and origin. What the 1838 surveyors recorded in Killeenrevagh was already, presumably, a low and unspectacular feature, the kind of thing visible to a trained eye in raking light but easily lost to agricultural improvement. The nineteenth century saw enormous changes to the Irish landscape, with land drainage, field consolidation, and intensive tillage removing countless such earthworks. In this case, the process was thorough enough that whatever bank once existed left no surface trace behind. The site is now known only because someone, at some point before the later map revisions, thought it worth recording.