Known in the archaeological record as Site N, it is a roughly circular enclosure averaging about five metres in internal diameter, with walls that stand only around twenty centimetres high and span some sixty centimetres in width. A well-defined entrance opens to the south-east, but the northern portion of the structure remains buried under accumulated peat and a tangle of rushes, concealing whatever arrangement of stones or interior features might still lie beneath. The peat has been both preserver and obscurer here, which is part of what makes the site quietly compelling.

Site N was recorded and described by Rynne and Ó hEailidhe in 1965, and it does not stand alone. It forms part of what the archaeological record identifies as an extensive settlement and cemetery complex dating to the Late Neolithic and Early Bronze Age, a period running very roughly from around 3500 to 1500 BC, when communities across Ireland were constructing monuments, burying their dead in organised ways, and living in small, often ephemeral structures that left only modest traces on the landscape. Piperstown Hill, sitting within the Dublin Mountains, appears to have been one such place of sustained habitation and ritual activity. The modest ring of stones at Site N is the kind of domestic remnant that rarely attracts attention in the way that a passage tomb or stone circle might, but it offers a different and arguably more grounded kind of connection to the period.

The site lies on the southern slopes of Piperstown Hill, and the surrounding terrain is open upland, with the bog that has encroached on the northern section of the structure still very much present underfoot in places. Visitors should expect rough, wet ground, particularly after rain, and should be prepared for the fact that the remains are subtle. The entrance on the south-eastern side is the most legible feature. The slight bank of peat visible in the western portion, noted by Rynne and Ó hEailidhe, is part of the character of the site rather than later disturbance. Drier months make the approach more manageable, and lower vegetation in late winter or early spring can make the stone ring easier to read in the landscape.