This is a rath, the Irish term for a ringfort, the kind of enclosed farmstead that was built and occupied across Ireland roughly between the early centuries AD and the Norman period. Thousands survive in various states across the country, yet each one carries its own particular geometry, and the example at Ahawilk has a detail that lifts it above the routine: attached directly to its south-eastern flank is a rectangular annex, a secondary enclosure that is relatively uncommon and suggests the site was organised to serve more than one purpose.

The ringfort itself is a circular area roughly twenty-five metres in diameter, enclosed by an earthen bank with an outer fosse, the term for a ditch dug to reinforce the enclosure's boundary. The bank survives to an internal height of around 0.4 metres and an external height of 0.65 metres, with the fosse running outside it to a depth of 0.35 metres and a width of approximately 2.6 metres. There is a gap in the bank on the east-south-east side, almost certainly the original entrance, also about 2.6 metres wide. The rectangular annex on the south-east side measures roughly eighteen metres on its north-west to south-east axis and fourteen metres across, and is defined by the main enclosure's fosse on its north-west side, by an extension of that fosse on the north-east and south-east sides, and on the south-west by what the survey describes as a steep fall in ground level. The record was compiled by Denis Power and uploaded in August 2011.

The site sits in level pasture, which means the earthworks are relatively easy to read as a whole once you are standing at the field boundary. The interior of the main enclosure is level and grassed over, so there is nothing to trip over, but the low banks are also easily underfoot if you are not paying attention. The annex is the feature worth examining closely; look for the way its boundaries shift from a dug fosse to a natural drop in the ground on the south-west side, which suggests the builders were reading and using the existing topography rather than simply imposing a standard form. As with most Irish ringforts on private farmland, access depends on the landowner's co-operation, and the site carries no formal visitor infrastructure.