What makes the spot quietly arresting is not grandeur but persistence: the main roof-stone, an irregular slab measuring roughly 2.85 metres by 2.07 metres, has settled at an angle, its eastern end dipping downward, while the side-stones it once balanced upon have fallen away beneath it. The whole structure looks less like a monument than like geology in the process of becoming, and yet it was clearly built, placed, and intended.

Megalithic tombs of this type are the remains of prehistoric burial chambers, originally constructed from upright stone slabs supporting one or more large capstones, sometimes covered by an earthen or stone cairn. At Formaoil, three slabs still protrude from beneath the roof-stone: one along what was probably the northern wall, at least 1.2 metres long; another along the south side, measuring 1.9 metres by 1.2 metres; and a small block nearby that may have served as a pad-stone, a wedging piece used to level or stabilise the structure during construction. The upper surface of the capstone is marked by solution pits, shallow hollows formed over long periods by weathering, a common feature on exposed prehistoric stonework in the wetter parts of Ireland. A scatter of small stones, including fragments of quartz, lies beneath the roof-stone; this may be the residue of later field clearance rather than original tomb material, a reminder that agricultural activity has shaped and disturbed these sites across the centuries.

The tomb sits with a wide, open view south across Ballinskelligs Bay, a sightline that feels deliberate, though whether that orientation carried ritual meaning or was simply practical is something the archaeology cannot settle. The Iveragh Peninsula holds a dense concentration of prehistoric remains, and this site, poorly preserved as it is, belongs to a landscape that was clearly inhabited and organised long before written record.