This small oval earthwork in County Limerick, sitting in pasture on what was once the deer park of the Cahir Guillamore demesne, does not appear on any of the historic Ordnance Survey Ireland maps, yet aerial photography has shown it to be an upstanding monument with an internal diameter of around eighteen metres. It sits within a dense cluster of overlapping heritage, with a deserted medieval settlement surrounding it, a field system extending to its south, a second ringfort just eighty-five metres to the east, and a standing stone less than a hundred metres to the north-east. The concentration is unusual enough to have prompted, at some point, rather ambitious local interpretation.

Writing in 1896, a commentator named Dowd recorded that the visible remains across this area had been described as "the remains of an ancient city of great extent," a phrase that says as much about Victorian enthusiasm for antiquity as it does about the archaeology itself. More careful analysis came in 1942, when Seán P. Ó Ríordáin and John Hunt published their survey of the Lough Gur region, in which they catalogued this earthwork as Fort 6, noting on the basis of aerial imagery that it appeared to be "a fort with a house in it." A ringfort, or rath, is a roughly circular enclosure defined by an earthen bank and ditch, used in early medieval Ireland primarily as a farmstead; the suggestion of an internal structure here makes it a more layered find than many comparable examples. The site remained visible on orthoimages captured between 2005 and 2016, confirming that the earthwork has survived reasonably intact beneath the pasture.

The site lies within the former Cahir Guillamore demesne, around twelve metres west of the townland boundary with Rockbarton. Because it sits in private agricultural land, access would require landowner permission and should not be assumed. Those with an interest in the wider landscape would benefit from cross-referencing the Ó Ríordáin and Hunt aerial survey material, which maps several monuments in relation to one another and gives a clearer sense of the settlement's scale. The earthwork itself is subtle at ground level; the oval outline is most legible from aerial imagery, so arriving with a map or an orthoimage print-out will help orient a visit considerably.