On the ground, the pasture at Raheen in the barony of Coshlea looks unremarkable, a working agricultural landscape with nothing to catch the eye. But viewed from above, a series of linear features emerge across the soil, the faint outlines of what may be an ancient field system, invisible to the Ordnance Survey cartographers who mapped the area at six-inch scale and absent from their published records entirely.

The site came to attention not through excavation or archival research but through an unlikely intermediary: an infrastructure project. Aerial photographs taken on 3 November 1984 as part of the Bórd Gáis Éireann Curraleigh West-Limerick gas pipeline survey, recorded at a scale of 1 to 5000, captured what are described as linear cropmarks across the area. Cropmarks form when buried features, ditches, banks, or walls, affect how vegetation grows above them, producing variations in colour or height that become legible from altitude. The pattern identified at Raheen is interpreted as the possible remains of a former field system, and the site is associated with a wider cluster of monuments in the immediate area. More recently, the earthworks have been confirmed as visible on Digital Globe orthoimages taken between 2011 and 2013, and on Google Earth imagery, lending the original aerial observation a degree of independent corroboration. The record was compiled by Fiona Rooney and uploaded to the national monuments database in September 2021.

There is no visitor infrastructure here and no marked trail. The site sits in private farmland, and the earthworks are not the kind of feature that rewards a walk across the field; the linear marks are simply not legible at ground level. The most useful way to engage with the site is through the aerial and satellite imagery referenced in the monuments record, which allows the faint geometry of the cropmarks to become apparent. Anyone with an interest in early land use and field systems in the Limerick region might cross-reference the site against the associated monument group, which may provide additional context for what this particular arrangement of lines once organised across the landscape.