No earthwork rises from the ground, no stone protrudes, no obvious feature interrupts the damp pasture. And yet, at the right time of year, from the right altitude, a perfect circle ghosts up through the grass, a cropmark betraying an enclosure that has otherwise left no impression on the landscape at all.

The site, in the townland of Camas, sits in low-lying ground prone to flooding, roughly 200 metres south of a watercourse that marks the boundary with the neighbouring townland of Ballynanty. A second enclosure lies about 200 metres to the south-east, suggesting this corner of Limerick once held more organised human activity than its current blankness implies. The Camas enclosure does not appear on any historic Ordnance Survey Ireland maps, which means it slipped entirely past the cartographers who documented the Irish landscape across the nineteenth and twentieth centuries. Its existence only came to light through an aerial photograph, reference BGE 1:5000 No. 48, taken on 3 November 1984 as part of the survey work associated with the Bórd Gáis Éireann Curraghleigh to West-Limerick gas pipeline. That kind of infrastructure project, for all its unglamorous purpose, has inadvertently contributed a great deal to Irish archaeological knowledge, with aerial surveys commissioned for pipeline routes frequently passing over fields that had never been photographed from above before. By the time orthophotography of the area was compiled between 2005 and 2012, nothing was visible at the surface. It was only a Google Earth image dated 20 September 2020, captured in dry summer conditions when soil moisture differences bring buried features into relief, that confirmed the circular cropmark still lurking beneath the pasture. The record was compiled by Martin Fitzpatrick and uploaded in March 2021.

Cropmarks appear when buried ditches or walls affect how plants grow above them. Former ditches retain moisture and produce lusher, greener growth, while buried walls have the opposite effect, stressing the vegetation above them. The result, invisible at ground level, can resolve into clear geometric shapes when seen from height in dry weather, particularly in late summer. For anyone curious enough to visit Camas, there is no monument to locate in the conventional sense. The coordinates point to an ordinary stretch of wet pasture. The nearest a visitor can get to experiencing the site as it is known is through the 2020 Google Earth image, which remains the clearest record of what lies a few centimetres beneath an unremarkable field.