Most of these early medieval enclosures, circular earthworks that once enclosed a farmstead or settlement, tend to occupy elevated ground, giving their inhabitants a clear line of sight over the surrounding land. The one at Ballyregan in County Limerick sits in flat, open pasture with poor visibility in every direction, a choice that raises more questions than the landscape answers.

The site has been traceable on maps for well over a century and a half. The Ordnance Survey six-inch map of 1840 already shows it as a circular enclosure, and by the time the twenty-five-inch map was produced in 1897, surveyors were recording a raised sub-circular area measuring roughly 41 metres north to south and 43 metres east to west, defined by a scarp and ringed by a double line. When the Archaeological Survey of Ireland examined it in 2000, the monument had contracted somewhat in measurable terms, recorded then as a raised circular area of approximately 30 metres in diameter, with a scarped edge around 2 metres wide and 0.6 metres high. A drainage ditch encircling the site was assessed as post-1700 in origin, suggesting later agricultural activity shaped its present appearance. A field boundary that once cut across the monument at the north-west corner has since been removed, leaving the earthwork more legible in outline, if not in detail.

Accessing the interior is not straightforward. A Google Earth image taken in June 2018 showed it densely overgrown and effectively inaccessible, which means the perimeter is likely to remain the limit of any visit. The surrounding pasture is level, so the slight elevation of the earthwork itself becomes more noticeable once you are close to it, the scarped edge giving a clearer sense of the original enclosure than the wider landscape might suggest. Those interested in the site's recorded dimensions and survey sketches can consult the Archaeological Survey of Ireland records, which include a sketch plan drawn up at the time of the 2000 survey.