No earthwork announces itself, no ring of stones breaks the grass line, and neither the first nor second edition Ordnance Survey six-inch maps record anything here at all. The site at Parkaderreen exists in the documentary record largely because an aerial photograph, Air Corps image V 312/3040-39, caught something the ground could not show: a circular cropmark, the subtle discolouration that forms when buried features affect how grass or grain grows above them, tracing the ghost of a structure that has otherwise sunk back into the field.

What survives above ground is partial and easily overlooked. The northern side of the enclosure has left no visible trace whatsoever. The southern arc survives only as a slight curving kink in an existing field bank, a gentle deviation in an otherwise unremarkable boundary. That bank measures roughly 0.8 metres across at the crest and 1.2 metres at the base, with an internal height of around half a metre and an external height of 1.3 metres. The enclosure itself measures approximately 29 metres east to west. On a south-facing slope of a flat ridge, set in reclaimed pastureland with gently undulating terrain around it, the landscape gives little away. Without knowing what to look for, and without the aerial photograph to confirm what the cropmark suggested, there would be almost no reason to pause here at all.