It is one of the quieter ways that archaeology surfaces in the Irish landscape: not through standing stones or dramatic earthworks, but through a barely perceptible change in how the ground grows. Here, a roughly D-shaped area of elevated terrain, around eighteen metres east to west and up to twenty-four metres north to south, is defined less by a wall than by a slight rise in the earth, a low scarp whose outer face drops only half a metre or so. It never appeared on any edition of the Ordnance Survey six-inch maps, the standard reference for Irish field archaeology for well over a century. It was only spotted through aerial imagery, and even then it resists easy interpretation.

What survives is scant. The curving eastern side of the enclosure is marked by that tell-tale scarp, two and a half to three metres wide at the base and barely a metre across at the top, with a slumped external slope that suggests the original boundary has long since settled into the hillside. There may be an entrance on the eastern side, where a break in the scarp appears, though nothing is certain. The western edge is defined by an existing north-south field wall, beyond which no trace of the enclosure continues. The southern arc is the most ambiguous part of the site; it may overlie or cut across the northern arc of a cashel, a type of stone-walled ringfort, that sits immediately to the south. A cashel's walls, typically drystone and roughly circular, were built to enclose a farmstead or small settlement, and the proximity of the two features suggests this elevated ground was used and reused across different periods. On the northern arc, the scarp drops to a low outer terrace, which in turn is edged by another faint rise; this outermost feature may simply be a later field boundary that followed the natural contour of the hill rather than anything deliberately defensive or domestic. In the level interior, a possible hut site occupies the northern half. To the north, the flat-topped hill of Knocknashee is visible on the skyline, itself a significant prehistoric site. Two ringbarrows, low circular burial mounds, lie around three hundred metres to the southeast, and another enclosure sits roughly three hundred and forty metres to the north-northeast, suggesting this part of Achonry was once a much more populated and structured landscape than the forestry plantations now covering much of it would imply.