Others exist only as shadows, legible solely from the air. The enclosure at Boherload, in County Limerick, belongs firmly to the second category. It was not found by a walker with a keen eye or a farmer turning soil, but by an analyst studying medium-altitude aerial photographs taken in 1986, where subtle differences in crop growth or ground tone can betray the outlines of structures that have long since vanished beneath the surface.

The discovery was made as part of the Ballyhoura Hills Project, a systematic survey led by The Discovery Programme, Ireland's state archaeological research body. The results of that survey were published in 2008 by Muiris Doody in a monograph of the same name, issued as part of the Discovery Programme Monograph series and printed by Wordwell. The Ballyhoura Hills straddle the Cork and Limerick border, a landscape that saw sustained human activity across many centuries, and the project used aerial photography alongside ground survey to build up a picture of settlement and land use in the region. The Boherload enclosure, catalogued under the reference LI022: Bruff 65: AP 4/3703, is one of the monuments identified through that process. An enclosure of this type generally refers to a defined area bounded by a bank, ditch, or wall, which in an Irish context might relate to a farmstead, a ceremonial site, or something in between, though without excavation the precise function of any individual example is difficult to confirm.

Because this monument was identified from the air rather than as an upstanding feature on the ground, there is little to see at surface level without specialist knowledge of what to look for and when to look for it. Cropmarks, which are among the most common ways such sites reveal themselves in aerial photographs, tend to show most clearly during dry summers, when buried ditches retain moisture and support taller or greener vegetation above them while surrounding crops stress earlier. Anyone visiting the wider Boherload area near Bruff in County Limerick should be aware that the monument sits on private agricultural land, and access would require the landowner's permission. The relevant documentation, including the aerial photograph reference and Doody's published analysis, is the most reliable way to understand what was recorded here and how.