The enclosure at Ballyheeragh sits on a slight rise above flat, wettish ground that stretches away to the north-east and east, and its interior is crowded with small stone grave markers, concentrated particularly in the south-east quadrant. The rath was used at some point as a children's burial ground, a practice common across Ireland in which infants who died unbaptised were interred in ancient, liminal enclosures rather than in consecrated ground. The result is a site that is at once a monument to early medieval settlement and a quiet, accumulative record of grief.

A rath is an earthen ringfort, the most common type of early medieval enclosure in Ireland, typically associated with the farmstead of a single family or small community. At Ballyheeragh the oval platform measures roughly 36.8 metres along its longer axis, defined by a substantial earthen bank that still stands up to 1.6 metres on its outer face, though it has been reduced almost to a scarp along the south-south-east to west section. Outside the bank runs a fosse, a defensive ditch, now only a shallow depression but still legible in the ground. Stones protrude from the sod along its outer edge. The bank itself retains a low internal lip, also stony, and there are traces of possible wall footings along its top, suggesting a later modification to the original earthwork. The north-east entrance is particularly well preserved: the bank terminals extend outward to either side, flanking a broad ramp-like slope about 2.7 metres wide, which probably once served as a causeway across the fosse. That causeway is now cut short by a field wall running along the road immediately to the north. A second rath lies just ten metres to the north of this one, making Ballyheeragh a notably concentrated spot in an already monument-rich landscape.