The circular earthwork at Ahalisky, roughly 34 metres across, was built on a northeast-facing slope, and whoever constructed it took the trouble to raise the interior on its eastern side to create a level living surface despite the hillside gradient. That kind of deliberate ground-shaping is easy to miss when the bank has weathered down to a modest 0.2 metres in height, with a more pronounced scarp of around 0.8 metres dropping away to the east on the downslope side.

This is a rath, a type of ringfort enclosed by earthen banks rather than stone walls, of the kind that once numbered in the tens of thousands across Ireland and formed the basic unit of rural settlement from roughly the fifth to the twelfth centuries. Most were farmsteads, home to a single family and their livestock, and the enclosing bank was as much a marker of status and territory as a defensive structure. The Ahalisky example sits within a field that also contains a second ringfort along the same ridge, which suggests the area was a focus of some activity during that period. More intriguing still is the souterrain recorded at the centre of the enclosure. A souterrain is an underground stone-lined passage or chamber, typically associated with ringforts and thought to have served for storage, refuge, or both. Finding one positioned centrally rather than tucked against the bank is a detail worth noting, though the site's overgrown condition makes any surface assessment difficult.