This one exists, for now, almost entirely as a shadow in a field. At Ballincarroona in County Limerick, a ringfort reveals itself not through any visible bank or mound but through a cropmark, the faint circular trace that buried archaeology leaves on growing vegetation when seen from above. In dry summers, the grass or grain above a buried ditch draws differently on moisture and nutrients, producing a ring of subtly different colour that only makes sense at altitude. The Ballincarroona example measures approximately 43 metres in diameter, placing it comfortably within the range of a typical early medieval ringfort, the type of enclosed farmstead that once dotted the Irish countryside in enormous numbers, generally dating to somewhere between the sixth and tenth centuries.

The site sits on poorly drained grassland, roughly 40 metres north of the Camoge River, which here forms the boundary between Ballincarroona and the neighbouring townland of Knocklong East. The ringfort was identified not by fieldwork on the ground but through analysis of Digital Globe aerial imagery captured between 2011 and 2013. The record was compiled by Caimin O'Brien and uploaded to the national record in November 2020. What the imagery shows is a circular ditch, the defining feature of a ringfort, a single enclosing earthwork that would originally have surrounded a farmstead and its inhabitants. Whether that ditch was ever accompanied by an internal bank, an entrance causeway, or any ancillary features is not currently known; the aerial record captures the outline and little more.

Because the site survives only as a cropmark, there is nothing to see at ground level under ordinary conditions. Visitors to this part of Limerick are better served by treating the location as part of a broader landscape rather than a destination in itself. The Camoge River nearby marks the old townland edge, and the surrounding countryside is the kind of low-lying, damp pasture that characterises much of this part of the county. If you have access to aerial mapping tools, comparing satellite layers from dry summers against more recent imagery gives a reasonable sense of how the cropmark emerges and then fades depending on the season and weather. The site is a reminder that a significant proportion of Ireland's early medieval settlement archaeology is only visible from the air, and that the landscape underfoot holds considerably more than the surface suggests.