The feature recorded near Rathanny in County Limerick belongs firmly to the second category. Visible from the air as a large rectangular cropmark, roughly 68 metres north to south and 85 metres east to west, it sits in reclaimed pasture close to the Camoge River and has the outward shape of an enclosure. Whether it is actually an enclosure in any meaningful archaeological sense is another matter entirely. Cropmarks, which appear in aerial photographs when buried features cause differential growth in overlying vegetation, can be produced by drainage works and land improvement just as readily as by ancient ditches or walls. In this case, the compilers of the record have flagged the monument as being of doubtful antiquity.

The feature was first identified during the Bruff aerial photographic survey of 1986, recorded as Bruff 65 (AP 5/2075), where it appeared as an L-shaped cropmark intersected by field drains at its northern and eastern sides. Later satellite imagery confirmed the rectangular outline, appearing on a Digital Globe image taken between 2011 and 2013 and on a Google Earth orthoimage dated 5 April 2006. Numerous additional linear cropmarks are visible in the same area, some running perpendicular to one another, and these are thought likely to represent drainage channels associated with nearby Rathanny House, which stands approximately 250 metres to the north-west. The suspicion, recorded by Fiona Rooney when the entry was compiled in June 2021, is that the apparent enclosure may simply be a product of those same land reclamation works rather than any prehistoric or early historic activity. What keeps it on the map, so to speak, is that the question has not been definitively closed.

The site sits in working agricultural land, and there is nothing visible on the ground that would distinguish it from the surrounding pasture. Its more rewarding neighbour is the multi-vallate barrow, a type of burial monument defined by multiple encircling banks and ditches, recorded about 130 metres to the east and considered considerably more certain in its antiquity. For anyone making their way through this part of south County Limerick, the Camoge River provides a useful landmark to the south. The Rathanny earthwork is best understood not as something to seek out in person but as a reminder that aerial survey regularly turns up features whose origins remain genuinely unresolved, sitting in a category somewhere between monument and field drain, awaiting closer investigation.