It is the kind of monument that rewards a second look. From the air, it reads as a C-shaped, tree-lined form; at ground level, it is something more complex and, in places, genuinely puzzling. By 1913, the Ordnance Survey recorded it as a partially levelled enclosure extending across three fields, already diminished but still legible. By the time surveyors described it in detail in 1972, what remained was an extensive earthwork complex, substantial enough to suggest this was once a place of some significance.

The main feature is an earthen bank, the rampart, defined on its outer edge by a fosse, which is simply a ditch dug to amplify the bank's defensive or enclosing effect. The rampart and its fosse are visible along much of the eastern, southern, and western arcs, though reduced to a scarp in places and carrying, unusually, an external stone facing. The northern arc has vanished entirely from view. On the western side, a short stretch of an inner bank survives, with traces of an intervening fosse between it and the main rampart, suggesting at least one phase of more elaborate construction. The fosse itself was partly cut into the side of a natural rise on the east, where the builders made deliberate use of existing topography. A disturbed gap on the east-south-east may mark an original entrance, though later interventions, including two modern causeways across the fosse, have complicated the picture. Inside the enclosure, the ground is uneven, with natural outcrops and scarps, and a slope near the centre appears to have been artificially steepened. At the north-east, a low marshy hollow fed from the adjacent raised bog may be a turlough, a seasonally flooding hollow typical of the Irish midlands limestone, which fills and empties according to groundwater levels rather than surface drainage. This waterlogged corner would have shaped how the interior was used and perhaps how the whole enclosure was conceived, with water as both a boundary and a resource.