The karst here, limestone bedrock worn into fissures and pavements by centuries of rain, gives the landscape a skeletal quality, and the enclosure sits within it as something equally spare: a grass-covered oval defined not by a dramatic wall but by a spread of stone, roughly three metres wide and less than half a metre high, with a shallow external fosse, or ditch, running around the outside. The entrance gap, just sixty centimetres across, faces south-east.

Inside the perimeter, two structures survive. Towards the north-west sits a drystone-built oval house, a form of construction in which stones are laid without mortar, relying on careful placement and gravity to hold the structure together. Its interior measures nearly ten metres along its longer axis and just over four metres across, with a south-facing entrance. Closer to the southern edge of the enclosure, a second, much smaller building survives only as a wall base, its floor plan a narrow rectangle roughly five metres by one and a half, entered from the north-east. Together they suggest a modest agricultural settlement, the enclosure functioning as a defined compound, perhaps for livestock, with domestic or working buildings arranged within. The overall site sits within a roughly rectangular area of land around 170 metres by 140 metres, bounded by the same rough upland terrain. Michael J. Moore documented all of this in the Archaeological Inventory of County Leitrim, published in 2003, though no precise date has been established for when the enclosure was built or occupied.

What makes Aghnahaha quietly compelling is how little has changed the place. The stone spread has not been robbed for field walls, the fosse has not been filled in, and the two house sites remain legible on the ground. Visitors approaching across the karst should look for the slight rise of the enclosure boundary before the interior becomes visible, and the narrow entrance gap is easier to identify from the outside than from within.