At ground level, in the pasture where it lies, nothing is visible at all. The feature only reveals itself when you know where to look and, ideally, when you look from the air.

What survives, or what can be inferred, is a long, narrow enclosure running roughly north-north-east to south-south-west, approximately 200 metres in length and around 35 metres wide. Locally it is described as two parallel earthen banks, each about four metres wide and two metres high, set some 20 metres apart and closed off at the southern end. The 1839 Ordnance Survey six-inch map records it as a narrow rectangular field extending southward from a house called Sea Lodge, and the same outline is still visible on the 1925 edition, suggesting it retained some legible form well into the twentieth century. It terminates about 30 metres to the north-east of a prehistoric burial mound, a proximity that may or may not be coincidental. Aerial photography adds a further complication: images show two ditches, set roughly ten metres apart, continuing southward beyond the mapped boundary of the feature for another 80 metres or so, which has led to the suggestion that the whole thing may once have been a roadway rather than an enclosure in the conventional sense. A linear earthwork used as a descriptive term simply means a bank, ditch, or combination of both running in a line across the landscape, and such features in Ireland can date from anywhere between the Bronze Age and the post-medieval period, making this one difficult to pin down without excavation.

The Hook Peninsula is already well known for its medieval lighthouse and its Norman heritage, but this quiet anomaly in a field near Loftushall sits well outside that familiar story, legible only to maps and cameras, and patient enough to wait.