Locally it was called the Round Garden, a roughly circular enclosure about forty metres across, bounded by what people remembered as a high, wide earthen bank. It sat in low-lying ground, with a natural rise to the west and a hollow dropping away to the east, the Palmerstown River running about 180 metres to the north. At ground level today there is nothing to see. Land reclamation levelled it entirely.

What makes the site quietly strange is the gap in its documentary record. The 1838 Ordnance Survey six-inch map, which captured so much of rural Ireland in extraordinary detail, does not show it at all. By the time the 25-inch plan was produced, the enclosure appears clearly, marked as a subcircular form with trees planted inside. On the 1922 six-inch edition it reappears again, this time without the trees. Whether the 1838 surveyors missed it, or whether it simply did not yet exist in a form worth recording, is not clear. That gap of several decades between the first absence and the first appearance leaves its origins genuinely open. The earthen bank that locals described is consistent with a range of uses, from a sheltered garden or plantation feature to an older enclosure repurposed over time, but nothing in the surviving record settles the question.