The feature does not announce itself to anyone walking the ground; the bog has long since covered it. But viewed from above, via satellite imagery captured in September 2010, a distinct vegetation ring appears against the surrounding peat, tracing the ghost of what was once a hut site on a gentle west-facing slope.

Blanket bog, which forms gradually over centuries as waterlogged conditions suppress decomposition and build up layers of peat, is both a preserver and a concealer. Structures beneath it can survive in remarkable condition precisely because the acidic, low-oxygen environment inhibits decay, yet they become effectively invisible at ground level. The circular form at Ballynultagh follows the pattern of early hut sites found across upland Ireland, where a single dwelling would be defined by a low wall or earthen ring, sometimes associated with seasonal pastoral activity or earlier permanent settlement. The diameter here, seven metres, falls within a range typical of such structures. No excavation record accompanies the site, and the date of its construction remains unknown.