The depression, roughly circular and about 3.8 metres across, sits just inside the bank of the enclosure, with a narrower channel extending roughly three metres to the south-east. Both features are thought to represent a collapsed souterrain, one of the stone-lined or timber-roofed underground tunnels that were commonly built in early medieval Ireland, typically for cold storage, refuge, or both. The fact that so little shows above ground is itself part of the story: these structures were deliberately concealed, and the earth has been slowly reclaiming this one ever since.

The ringfort in which it sits occupies a commanding position on the gentle rise, with open views to the east, south, and south-west across the undulating Westmeath pasture. Ringforts, the enclosed farmsteads of early medieval Ireland, were often furnished with souterrains, and the positioning of this one immediately inside the north-eastern bank follows a pattern seen at sites across the country. Here the entrance passage and the main chamber appear to have fallen in at some point, leaving only the faint impressions in the turf that are visible today. The site sits within a wider agricultural landscape that has been grazed for centuries, which has both preserved the earthworks and, over time, softened every edge.