The earthwork measures roughly 21.5 metres north to south and 21.3 metres east to west, with an interior height of only 0.3 metres above the surrounding ground and an exterior scarp barely half that. What makes it quietly peculiar is not its current appearance but its recorded history on paper: the Ordnance Survey six-inch map of 1842 shows the feature as a hachured circular depression, while the equivalent map from 1936 renders the same spot as a hachured circular raised area of the same diameter. The ground, in other words, appears to have flipped between sunken and elevated over roughly a century of cartographic observation, a discrepancy that may reflect erosion, agricultural disturbance, or simply differing interpretations by surveyors working generations apart.

The site almost certainly belongs to the broad tradition of Irish enclosures, a category that overlaps with ringforts, the circular earthen or stone-banked farmsteads that were built and occupied primarily during the early medieval period, roughly the fifth to the twelfth centuries. A ringfort typically enclosed a family's dwelling and ancillary structures within a raised bank and ditch, and thousands survive across Ireland in varying states of preservation. The Broghill example is on the slighter end of the scale, but it does not stand in isolation. An adjoining field immediately to the west contains both a ringfort and a separate earthwork, suggesting that this corner of north Cork once held a small cluster of related activity, several features in close enough proximity to imply connected use of the landscape rather than isolated accident.