It is classified as a promontory fort, a type of coastal enclosure in which a naturally defensive headland was sealed off from the landward side by an artificial barrier, making the sea itself the primary defence. What makes this particular example quietly curious is that it has never been marked as an antiquity on any edition of the Ordnance Survey six-inch map, meaning it passed through the entire history of Irish cartographic record without official recognition as a site of archaeological interest.

The promontory measures roughly 30 metres along its north-west to south-east axis and 27.5 metres across, making it a compact space. The feature that cuts it off from the surrounding land at its south-eastern end is a low bank of earth and stone, approximately 2.5 metres wide and between 0.3 and 0.6 metres high. That modest earthwork is now thought to be a relatively modern, disused field boundary rather than an ancient defensive rampart, which complicates any straightforward reading of the site. The 1913 edition of the Ordnance Survey map does name the location, recording it as Lackavarna. Within the same townland, roughly 60 metres to the south-east, there is a second possible promontory fort, suggesting this stretch of coastline may have seen repeated or overlapping use of naturally fortified ground.