A circular enclosure roughly 35 metres in diameter once occupied this rise, 500 metres north-west of Hillswood House. The nineteenth-century Ordnance Survey six-inch maps caught it clearly enough to fix its outline, but whatever earthworks or boundaries once defined it have since been entirely absorbed back into the grass. No surface trace remains.

Circular enclosures of this kind are common across the Irish landscape, typically interpreted as the remains of ringforts, the enclosed farmsteads of early medieval Ireland in which a family and their livestock sheltered within a raised earthen bank or stone wall. That this one has vanished so completely is not unusual; centuries of farming, drainage work, and simple weathering have erased countless such features. What gives the Hillswood site a slightly stranger quality is what stands nearby. On the hill to the north, four limestone posts rise from the top of a wall running east to west. Locally they are known as 'The Spikes'. No explanation is offered for them in the historical record, and their relationship, if any, to the enclosure below is unclear. They may be relatively modern field furniture, or something older repurposed into a boundary feature; without further investigation it is impossible to say.

The juxtaposition is quietly odd: a site that exists now only as a cartographic memory, beside a set of stone posts with a name but no recorded history. The Spikes, at least, are still there to be seen.