Invisible at ground level, the relic field system at Garryduff in the barony of Coonagh reveals itself only from above, its boundaries emerging as cropmarks or soil shadows in aerial photographs and satellite imagery. It is the kind of place that exists most clearly as an idea, a former arrangement of land that has quietly outlasted everything built upon it.

The field system was identified as a relic landscape through the Bruff aerial photographic survey, which logged it across two frames, Bruff 15.1 and 15.2, under reference AP 4/3621. A relic field system is exactly what it sounds like: the fossilised remains of agricultural enclosures that were once actively worked but have since been absorbed into later land use, surviving only as subsurface traces or faint earthworks. At Garryduff, those traces are substantial. The system consists of two parallel boundaries running roughly northeast to southwest, connected by lateral boundaries crossing between them, covering an area approximately 400 metres north to south and 130 metres east to west. The layout clusters around an associated enclosure recorded separately in the national monuments record. Traces of the system were already visible on the Ordnance Survey six-inch map of 1840 and the twenty-five-inch edition of 1897, suggesting the boundaries were at least partially legible as earthworks during the nineteenth century. More recent orthoimagery, including Ordnance Survey Ireland images from 2005 to 2012, Digital Globe images from 2011 to 2013, and a Google Earth capture dated 18 November 2018, confirms the system remains detectable. A neighbouring recorded feature, LI024-222, may represent the south-western continuation of the same field system.

The site sits on flat, wet pasture, which is both the reason the landscape survived and the reason a visit offers little obvious reward at eye level. There is no monument to inspect, no visible wall or bank to follow. The value here is cartographic and aerial rather than physical. Anyone curious about the site would do well to consult the relevant OSi historical maps alongside the more recent satellite layers, where the parallel boundaries and their connectors become legible as a coherent pattern. The associated enclosure, recorded under LI024-089, provides a fixed point of reference in the landscape and may be the most tangible feature accessible from the surrounding area.