What appears on one as a tidy grove of trees has, by the next survey, transformed into something altogether more architectural: a semi-circular earthwork roughly twenty-six metres in diameter, its presence marked by a raised scarp running from east, around through south, and back up to north. The discrepancy is not easily explained, and by the time satellite imagery was captured between 2011 and 2013, even that earthwork had apparently vanished, leaving farm buildings to the north and east and no visible surface remains at all.

The site sits immediately south of farmbuildings on the estate of Fort Etna House, the main structure standing about seventy metres to the north. The house dates to the eighteenth century, and the surrounding landscape was laid out in the manner typical of that period, with formal gardens and planted features designed to complement the residence. The 1840 Ordnance Survey six-inch map shows the area in question as a roughly rectangular grove, indicated by a dotted boundary line, placed adjacent to those formal gardens. Designed landscape features of this kind were common on Irish demesnes of the era, and could serve purely aesthetic purposes or function as kitchen gardens, nursery enclosures, or sheltered planting areas. By the time the more detailed OS twenty-five-inch map was produced, the record had shifted to show a semi-circular earthwork with a defined scarp, suggesting either a change in use or simply a more precise survey reading of an existing feature. A structure is also noted immediately to its north on that later map, though no further detail is given.

The site is not formally accessible as a heritage attraction, and given that recent aerial imagery shows no surface trace, any visit would be a matter of reading landscape rather than inspecting fabric. The farmland south of Fort Etna House is private, so any approach should involve seeking permission beforehand. Those interested in the cartographic history of the site would do well to compare the two Ordnance Survey editions directly, since the shift from rectangular grove to semi-circular earthwork between the six-inch and twenty-five-inch maps is itself the most legible part of the story. What survives, if anything, lies beneath working agricultural ground.