No mound, no stone, no obvious disturbance marks the ground. The only way to see it is from above, and even then only under the right conditions: a ring-ditch roughly nine metres in diameter, revealed as a cropmark on aerial imagery.

Cropmarks appear when buried features, ditches, pits, or walls affect how plants grow above them. Soil that once filled a ditch tends to retain more moisture, producing lusher, taller crops that show as darker lines or curves when viewed from the air, particularly during dry spells when the contrast is sharpest. Ring-ditches of this kind are typically the remnants of prehistoric funerary or ceremonial monuments, often the eroded bases of round barrows where a central burial mound has long since been ploughed flat, leaving only the encircling ditch as a ghost in the soil. The Slanestown example, with its roughly nine-metre diameter, sits comfortably within the range seen at similar sites across the Irish midlands. It was identified from a Google Earth orthoimage captured on 13 September 2020, with the record compiled by Caimin O'Brien from details provided by Jean-Charles Caillère.