The feature in question is a V-sectioned fosse, that is, a defensive ditch dug to isolate a headland from the mainland behind it, leaving whatever stood on the promontory accessible only by crossing that barrier. This one is eight metres wide at the top and 1.7 metres deep, slicing across a ridge-like headland just forty metres long and ten metres wide. Outcropping rock along the fosse gives the appearance of stone revetment, the kind of facing used to stabilise earthwork walls, though it may simply be natural geology presenting itself conveniently. Beyond that, the interior offers almost nothing: no bank, no structure, no obvious trace of occupation.

The word "possible" carries real weight here. Promontory forts are among the more ambiguous categories of Irish archaeological site, since the sea itself does much of the defensive work and the human contribution can be minimal. What marks this place out, beyond its dramatic coastal setting in mountainous bogland with higher ground rising to the east, is its connection to a passing reference made by the antiquarian Thomas Johnson Westropp in 1912. Westropp noted a suitable fort-site in this townland without specifying its exact location, and this fosse-cut headland has been put forward as the likeliest candidate for what he had in mind. It sits just seventy metres to the south-east of another confirmed promontory fort in the same area, which raises the question of whether two such sites in such close proximity reflect successive use, territorial subdivision, or simply two generations of people who recognised a good defensive ledge above the Atlantic when they saw one.