It exists, for practical purposes, only from the air. No wall survives to trip over, no earthwork rises above the surrounding farmland to catch the eye. What remains is a faint cropmark or soil discolouration, the kind of trace that becomes legible only when light falls at the right angle across a field, or when a camera points downward from a low-flying aircraft.

The enclosure was identified by The Discovery Programme, an Irish research body dedicated to the archaeological investigation of the country's ancient monuments, during a survey of medium-altitude aerial photographs taken in 1986. The results fed into the Ballyhoura Hills Project, a systematic study of the landscape around the Ballyhoura Mountains that straddle the Limerick and Cork border. Maeve Doody published the findings in 2008 in a Discovery Programme monograph, cataloguing a range of features, enclosures among them, that had gone unrecorded simply because no one had looked at the landscape from above with any rigour before. The Skool enclosure carries the reference LI022: Bruff 102: AP 4/3653, and the record was compiled by Denis Power and uploaded to the national monuments database in September 2013. An enclosure, in the archaeological sense, is broadly any defined area bounded by a bank, ditch, wall, or the ghostly remnant of one; they range in date from the prehistoric through to the early medieval period, and their original function, whether domestic, agricultural, or ritual, is rarely obvious without excavation.

There is nothing for a visitor to see on the ground in any conventional sense, which is itself part of what makes this kind of site worth knowing about. The Ballyhoura Hills area rewards slow travel along minor roads, and the broader landscape that the Discovery Programme surveyed is full of monuments both visible and invisible. Anyone interested in the aerial photography methodology, or in the wider findings of the Ballyhoura Hills Project, would do well to seek out Doody's 2008 monograph, which sets this particular cropmark within a much fuller picture of how people shaped and occupied this corner of Limerick over several millennia.