That compactness is part of what makes it arresting: whoever built this place was working with a very precise piece of coastal geography, using the sea on three sides to do most of the defensive work for them.

The landward side, the neck of the promontory where the sea's protection runs out, is where the human effort concentrated. A promontory fort is essentially a defended headland, where a bank and ditch cut across the approach to seal off the exposed end of a coastal spur, and here those elements survive in reasonable condition. The earthen bank, partially faced with stone, still stands 3.7 metres high, and in front of it the fosse, a defensive ditch, drops to a depth of 2.4 metres. Together they would have presented a formidable obstacle across what is otherwise open ground. On the southern side of the bank there is a gap 2.4 metres wide, with a rough causeway laid across the fosse at that point, suggesting this was the original entrance. Inside, a low remnant of another earthen bank, just 0.4 metres high, runs along the northern edge of the interior, while the southern side has become overgrown right to the cliff edge. The exact date of construction is not recorded, but Irish coastal promontory forts of this type are generally associated with the Iron Age, though some continued in use or were reused in the early medieval period.

The site sits within the broader landscape of the Mizen Peninsula in west Cork, overlooking Dunmanus Bay. The scale is modest but the engineering logic is clear even now: a small community, or perhaps a single extended family, chose this sliver of headland and made it defensible with the minimum of earthwork necessary, letting the sea and the cliffs carry the rest of the burden.