Up to twelve separate stretches of walling survive on the reef's surface, composed variously of limestone rubble and intermittent boulders. The longest of them runs only twenty metres, and the tallest point reaches no more than forty-five centimetres above the ground. What survives, then, is barely a ghost of a field system, yet the layout is coherent enough to suggest that people once divided this elevated ground deliberately and methodically.

The reef itself is a striking location for any kind of human activity. It commands views in all directions, with Tralee Bay opening out to the south and south-west. Michael Connolly, in his 2008 doctoral thesis on the prehistoric settlement of the Lee Valley at University College Cork, placed this field system within a wider landscape of early activity in the area. The reef lies ninety metres north-west of a second limestone feature where related remains have also been recorded. A field system is essentially a network of boundary walls or earthworks used to divide and manage land, whether for grazing, cultivation, or territorial marking, and prehistoric examples in Ireland can range from elaborate, well-preserved complexes to fragmentary traces like these. The mixed construction here, sometimes rubble, sometimes spaced boulders with rubble between, may reflect different phases of use or simply the pragmatic use of whatever stone was at hand on a limestone outcrop.

The walls are low enough to require close attention to spot, and the reef's open aspect means the surrounding landscape reads almost as clearly today as it might have to whoever first built here. The relationship between this elevated vantage point and the activity recorded on the adjacent reef to the south-east suggests that Kerries repays careful, unhurried looking rather than a quick pass through.