Seen on plan, the outline forms something close to a keyhole, an irregular ring with a pronounced narrowing, its drystone walls still legible at the south-west but absorbed elsewhere into a more recent field boundary that runs straight across where the older structure once curved.

The enclosure belongs to a category of site found across early medieval Ireland, where communities or individual farmsteads were defined by a circular or oval boundary wall, sometimes purely domestic in function, sometimes carrying ritual or symbolic significance. What makes the Cregg example quietly compelling is what lies inside: a souterrain, an artificially constructed underground passage or chamber, typically built from stone and roofed with lintels. Souterrains were used in early medieval Ireland variously for storage, refuge, or both, and their presence within an enclosure often suggests the site was in active use over a sustained period. The Cregg enclosure is poorly preserved and heavily overgrown, with a gap in the wall at the south-west that appears to be a modern intervention rather than an original entrance, which means the true threshold of the place has likely been obscured or lost entirely.