A subcircular hollow, roughly 25 metres by 20 metres, once appeared on the third edition of the Ordnance Survey six-inch map, surveyed in 1932, labelled in a way that suggested deliberate planting rather than any agricultural or structural purpose. Today, no surface trace survives. The ground has absorbed it entirely.

The feature is believed to have been a tree-ring, a landscaping device common in the designed demesnes of eighteenth and nineteenth-century Ireland, where trees were planted in circular or oval arrangements to create ornamental focal points within a gentleman's estate. This particular example is thought to have been associated with Hillsbrook House, which stands around 325 metres to the south-east. A second, comparable feature lies approximately 300 metres to the east-south-east, suggesting that whoever laid out the grounds of Hillsbrook did so with some intention and symmetry. Two ornamental plantings of similar form, positioned at comparable distances from the main house, point to a considered design rather than incidental planting.

What remains is essentially cartographic. The 1932 map preserved a record of something that had already, perhaps, begun its slow disappearance into the pasture. The grassland that now covers the site gives no indication of what was once arranged there, and without the map evidence the feature might never have been identified at all.