It measures roughly ten metres along its longest axis and rises just 1.3 metres above the surrounding ground. To a passing eye it might read as a natural undulation in the landscape, the kind of thing you would not think twice about. The 1837 Ordnance Survey six-inch map, however, records it plainly as the "site of cairn", a cairn being a mound of heaped stone, typically prehistoric, often associated with burial. That early cartographic note is one of the few formal acknowledgements the site has ever received.

The mound's modest appearance may owe something to the coming of the railway. According to Healy (1975), the cairn was probably quarried for stone during the construction of the Dublin to Drogheda line, which runs directly beside the site. The removal of surface material would explain why the monument looks so worn down and fragmentary. Yet when the site was subjected to geophysical survey, including magnetometry, resistivity, and ground-penetrating radar, the results complicated that picture considerably. The survey, carried out in 2004, identified several pits close to and within the monument, and detected a large anomalous feature in the mound's interior, suggesting that the underlying structure is considerably better preserved than its surface condition implies. Whatever the railway builders took away, they appear to have left something significant beneath.

The site sits above Barnageeragh beach, with the Dublin to Drogheda railway line running nearby as a useful orientation point. There is no formal demarcation, no signage, and no visitor infrastructure of any kind, so finding the mound requires a degree of attention to the landscape. The field boundary that incorporates part of the mound is itself worth noting, since it speaks to how prehistoric features are often absorbed quietly into later agricultural patterns rather than preserved in isolation. The site is described as unchanged despite surrounding development, which means the ridge-top position and the outline of the mound, subtle as it is, should still be legible on the ground to anyone looking carefully enough.