The ground looks like ordinary grassland. Yet nineteenth-century Ordnance Survey six-inch maps recorded something here quite clearly: a circular enclosure roughly 35 metres in diameter, and within it, a cist burial ground, the abbreviated form CBG referring to a cluster of stone-lined graves of the kind associated with early medieval or prehistoric funerary practice. The enclosure itself would have been a roughly circular earthwork, typically formed by a raised bank and internal ditch, used in early medieval Ireland as a farmstead or occasionally as a place of ritual significance. Whatever stood or lay here, it has since been levelled entirely, leaving no visible surface trace.

The disappearance of such sites from the Irish landscape is not unusual. Agricultural improvement over the centuries, particularly intensive ploughing and land drainage, has erased enormous numbers of earthworks that survived long enough to be captured by the first systematic mapping of the country in the nineteenth century. The OS six-inch series, produced from the 1830s onwards, effectively froze a record of features that were already, in some cases, beginning to disappear. Glenrevagh's enclosure is one of many that exist now only as a cartographic memory, their location fixed on a map sheet, their physical form gone. The combination of an enclosure with a burial ground inside it suggests a site of some complexity, possibly one with a long history of use across different periods, though without excavation it is impossible to say more with any precision.