The site, measuring approximately 34 metres from east to west, appears as a cropmark; a tell-tale sign where buried ditches affect plant growth, creating visible patterns best seen from above. These marks were first documented in Digital Globe orthophotos taken between 2011 and 2013, with earlier evidence visible in Google Earth imagery from February 2009.

The earthwork’s true nature remains tantalisingly uncertain. Given its location in reclaimed grassland and the presence of drainage ditches throughout the field, it may simply represent groundworks from post-1700 land reclamation efforts, when vast stretches of Irish wetlands were systematically drained for agriculture. However, the subrectangular shape and ditch configuration hint at a more intriguing possibility; this could be the remains of a medieval moated site, where a manor house or farmstead once stood surrounded by water-filled ditches for both defence and status.

Such moated sites were particularly popular in medieval Ireland between the 13th and 15th centuries, often built by Anglo-Norman settlers or wealthy Irish families. If this interpretation proves correct, the Kilmacow earthwork would join hundreds of similar sites scattered across the Irish landscape, most now visible only as cropmarks or subtle earthworks in farmers’ fields. The investigation, compiled by Caimin O’Brien in May 2020, serves as a reminder of how modern aerial photography continues to reveal Ireland’s hidden past, one field at a time.