It measures roughly nineteen metres long by seven and a half metres wide, and is partially enclosed by a rough stone wall about a metre high on its eastern, southern, and western sides, with the northern edge cut directly into the hillslope itself. A few grave markers remain visible inside.

Places like this are found across Ireland and are commonly called cillíní, informal or unconsecrated burial grounds used historically for unbaptised infants, who under Catholic doctrine could not be interred in consecrated churchyards. They tend to occupy marginal land, boundaries, and slopes, often without official recognition, and their names and locations were preserved primarily through local memory rather than formal record. The Cappaboy Beg site fits this pattern closely. Its wall construction is rough and functional rather than monumental, the kind of enclosure raised by families rather than ecclesiastical authorities, and the fact that it is cut into the hillside on the northern edge suggests it was shaped as much by the natural contours of the land as by any formal design.