A cashel is a stone-built ringfort, the dry-stone equivalent of the more familiar earthen rath, and this one has slumped into an irregular spread of rubble roughly twenty metres across at its widest point. What makes the site quietly puzzling is that not all the stone belongs to the original structure. Several large boulders mixed into the perimeter are almost certainly field clearance material, dumped there by farmers over the centuries who found the old wall a convenient place to dispose of stones turned up by the plough or the spade. This layering of ancient monument and agricultural practicality is common across Ireland, but it makes reading the original form genuinely difficult. There are no indications of the wall's original thickness, and no obvious entrance feature survives.

The site is known locally as a raheen, a diminutive of the Irish word ráth, meaning a circular enclosure or fort. The term tends to be applied affectionately to smaller or more ruinous examples, and its survival in local speech at Knockaphrumpa suggests the feature has been a recognised landmark in the landscape for generations, even as its original purpose faded from memory. The interior of the enclosure is slightly uneven underfoot, which can indicate subsided features beneath the surface, though nothing definitive is recorded here. Along the western edge, a hedgerow running roughly north-north-west to south-south-east skirts the site and may even have clipped its original extent slightly, a reminder that field boundaries, which look permanent, are often later impositions on a much older landscape.

The site sits on average grazing land and is grass-covered, with occasional small hawthorn bushes growing inside the old enclosure. The hawthorns are worth noting: in Ireland, lone thorns growing within or near ancient monuments were traditionally left uncut, associated in folk belief with the otherworld, and their presence here, whether by accident or old habit, adds an atmospheric layer to what is otherwise a quietly overlooked scatter of stone on a Wicklow hillside.