What makes it quietly puzzling is the absence of any visible entrance. Whatever this enclosure was built for, it gave nothing away about how, or whether, people were meant to move in and out of it.

The structure is roughly thirty metres in diameter, and the earthwork that defines it is more substantial than a casual glance at overgrown scrub might suggest. The bank survives most clearly at the south-east and north-west, where it still stands up to 1.2 to 1.8 metres high on its outer face, with a width of around five metres. Elsewhere the boundary takes the form of scarps, sheer or steeply sloping faces of earth cut into the ground, ranging from half a metre at the south-west to a more pronounced 1.6 metres at the north-east. Outside this inner boundary lies a flat-bottomed fosse, the term for a defensive or boundary ditch, between five and eight metres wide at the top and still up to two metres deep in places. An additional field bank, standing about 0.8 metres high, sits beyond that. The layered quality of the earthworks, bank, then ditch, then another bank, suggests deliberate and considered construction rather than gradual accumulation. Embanked enclosures of this type appear across Ireland and are variously associated with settlement, ritual, or agricultural use, though without excavation it is rarely possible to say which. The level landscape around Boley, unremarkable to a passing eye, preserves this arrangement largely intact beneath its canopy of trees.