That is precisely the point. A holy well once occupied this spot, described in 1896 as a carefully constructed oval or roughly circular stone enclosure, approached by descending stone steps from the surrounding grass, and probably once roofed with flagstones or timber boarding. By the mid-1980s it had been filled in entirely, leaving, as the record bluntly notes, no visible surface trace. What makes this particular absence linger is the well's old local name: the British Well. Writing in the Journal of the Royal Society of Antiquaries of Ireland, the antiquarian W. F. Wakeman recorded that the neighbourhood's older residents used that name within living memory, and he confessed frankly that how it came by so singular a title must remain a subject for conjecture.

Wakeman also noted that a parcel of land nearby was known to local people as Mimoge or Moymoge, interpreted as meaning the Plain of Mogue. St Mogue, known variously as Mædhog, Mæog, or Aedan, was one of the more celebrated figures of early Irish Christianity, and the association, however tenuous, places this unremarkable green space within a much older devotional landscape. The well sat just inside the gate of a lawn belonging to the Abbey, described by Wakeman as a residence of the Espinasse family dating from the sixteenth century. The wider site is considerably richer than the filled-in well alone suggests: it encompasses a pre-Norman church with a late medieval chancel, a graveyard, a bullaun stone (a large boulder with one or more carved hollows, associated with early ecclesiastical sites and sometimes used for grinding or ritual), two graveslabs, a stone font, and the base of a stone cross. Two crosses from the former laneway into the graveyard have since been removed to the care of the Office of Public Works in Trim, county Meath.

The site lies to the north-east of Kill Abbey road, and the surviving above-ground elements of the complex remain accessible. The bullaun stone and church fabric are worth examining closely, given that the well itself offers nothing visible to the eye. The OSi 25-inch map still marks the word Well at the relevant location, which gives a faint cartographic ghost of what once existed. For anyone interested in how early medieval sacred sites were layered, adapted, and eventually erased, this quiet patch of south County Dublin rewards attention precisely because so much has disappeared from it.