At Cowpark in County Limerick, the traces of what may once have been a formal ecclesiastical enclosure around Killeen Church have been so thoroughly absorbed into the landscape that only aerial photography and close reading of Ordnance Survey maps reveal that anything unusual is there at all. No earthwork announces itself. No bank rises above the grass. Yet the geometry of an older, purposeful arrangement persists just below the threshold of ordinary observation.

Ecclesiastical enclosures, typically circular or oval earthen boundaries demarcating the sacred ground of an early Irish church site, were once common features of the Irish Christian landscape. They defined the spiritual and sometimes legal boundary of a monastic or church settlement, separating consecrated ground from the secular world beyond. At Killeen Church, the National Museum of Ireland's topographical files note that traces of such a circle were recorded in proximity to the church, and that a curving arc of an earthen bank, lying approximately 27 metres to the north-west, is visible on Digital Globe aerial photography when viewed from the west-north-west to north-west. On the current edition of the OS six-inch map, this curving bank appears not as an earthwork but as a contour line, blending into the ordinary notation of terrain. Researcher Caimin O'Brien compiled the record, uploaded in April 2018, working from both archival sources and aerial imagery, including an ASI aerial photograph taken in March 2006. The bank may have formed part of an enclosure surrounding Killeen Church, though the evidence stops carefully short of certainty.

At ground level, there is nothing to see of the enclosure itself. The area to the north-west of the church, where the curving bank lies, is now occupied by an old quarry, visible on aerial photographs as a patch of scrub vegetation. A visitor approaching the site should not expect a dramatic earthwork or a clearly defined boundary. What the place offers instead is the quieter experience of knowing that the shape of something very old is still faintly legible from the air, even as it has been overwritten by quarrying and vegetation at ground level. The OS six-inch map, read carefully, is perhaps the most useful tool to bring.