Enclosure, Lisnaroe Near, Co. Monaghan

The mound itself, a ditch-barrow, a type of burial monument defined by a surrounding ditch rather than an external bank, is still visible. What is no longer visible is the circular enclosure that once surrounded it, roughly forty metres across, its boundary marked by a scarp about a metre in height. That outer feature has effectively melted back into the hillside, leaving the mound as an uncontextualised remnant of something more complex.

The story of how we know the enclosure existed at all is bound up in the particular archaeology of Irish map-making and field recording. The Ordnance Survey's six-inch map of 1834 shows both the mound and the wider feature together, labelled simply as a plantation, suggesting the area was wooded or managed in some way at that time. By the 1907 edition of the same map series, the enclosure appears more explicitly, with the mound marked by hachures inside it. A field observation made in 1948 captured the scarp while it was still legible, describing a roughly circular area running north to south, its defining edge most pronounced from the north-west around to the south-west before merging indistinguishably with the natural slope of the drumlin. That description is now the most precise record of something that can no longer be verified on the ground. Drumlins, the elongated ridges of glacial till that give Monaghan much of its rolling character, tend to have steep enough flanks that earthworks on their summits are vulnerable to slippage and agricultural smoothing over time.