Three compact sea-facing spurs, each tiny by any measure, were individually cut off from the mainland by an earthen bank and outer fosse, the fosse being a defensive ditch dug to heighten the effective height of the bank behind it. The interiors enclosed by these works are remarkably modest, none of them longer than eleven metres or wider than seven, and the banks themselves rise no more than a metre above the base of their accompanying ditches. Sheer cliffs drop away on either side of each headland, making the sea completely unreachable from within. Whatever these spaces held, it was not a large garrison.

What makes the arrangement at Kilfarnoge particularly unusual is the relationship between the three small headlands and the broader point behind them. Parkmore Point, the mainland mass from which the three spurs project, carries its own traces of enclosing banks and ditches, suggesting that the headlands were not independent fortifications but subsidiary elements within a larger defended complex. The remains of the main enclosing bank are still visible between two of the smaller headlands. Recorded and described by Casey in 2002, the site presents a layered defensive logic: a substantial outer enclosure anchored to the point, with smaller discrete enclosures projecting beyond it towards the sea. Whether the whole complex was built at one time or accumulated in phases is not clear from what survives. The surrounding land, described in 2002 as fertile grazing ground, suggests the area was worth controlling, even if the scale of the fortifications seems disproportionate to the modest size of each enclosed interior.