The site at Carrigoon shows itself as a yellowish soil mark, roughly subcircular in shape and measuring around fourteen metres on its longest axis, the kind of trace that only becomes legible when crops grow unevenly over buried ground, drawing moisture and nutrients differently from the disturbed soil beneath.

A ringfort, for those unfamiliar with the term, is a circular or near-circular enclosed settlement, typically defined by one or more earthen banks and ditches, that was in common use across Ireland from the early medieval period onwards. Thousands survive in various states of preservation, but many others have been levelled by centuries of agriculture, leaving only these ghostly impressions in the soil. At Carrigoon, local knowledge holds that this faint mark is the remnant of one such enclosure, though what lies beneath the surface and when it was last substantially intact remains unrecorded. The subcircular outline, at roughly fourteen metres northeast to southwest and ten metres northwest to southeast, is modest even by the standards of smaller ringforts, suggesting a single enclosed space that might once have contained a house or outbuildings within a low earthen perimeter.