That, in itself, is one of the more quietly unsettling things about the earthwork at Lisaquill in County Monaghan. Despite the site being measurable, mappable, and physically present in the landscape, its original entrance has never been identified, leaving the question of how people moved in and out of this enclosure genuinely unresolved.

The fort takes the form of an oval grass-covered area, roughly 48 metres along its north-west to south-east axis and 31 metres across, sitting on a south-east-facing slope. It is defined by an earthen bank, the kind of raised boundary used in early Irish enclosures to demarcate space, whether for settlement, ceremony, or the protection of livestock and people. That bank survives well on the north-western side, where its base is around 4.6 metres wide and it still stands to a meaningful height internally and externally. Towards the south-east, however, it has been considerably worn down, and along the southern and south-western arc it has disappeared almost entirely. There is no visible fosse, the term for the ditch that typically runs alongside such a bank, which either never existed here or has been filled in over time. A road bank now surrounds part of the perimeter on the east-south-east to southern side, adding a layer of later landscape activity that complicates any reading of the original form. Some bushes grow along the western to northern stretch, the kind of scrubby vegetation that often colonises old earthworks and, in Irish tradition, was sometimes treated with a certain wariness around such sites.