The ground is pasture now, a north-east facing slope where cattle graze and nothing breaks the surface. Yet the site is recorded, mapped, and counted among the archaeological monuments of the county, a ghost in the inventory of a landscape that has quietly erased it.

What survives is a cartographic trace. The 1842 Ordnance Survey six-inch map marks a circular area of roughly forty metres in diameter, indicated by a dotted line, the conventional notation for something the surveyors could identify but not firmly delineate. That circle represents what was once a rath, the Irish term for a ringfort, which typically consisted of a raised earthen bank enclosing a roughly circular space used as a farmstead during the early medieval period, broadly from around the fifth to the twelfth century. Thousands of these were built across Ireland; many survived into the modern era as grassy banks and ditches, while others were levelled by centuries of agriculture. At Garrycaheragh, the levelling was thorough enough that by the time anyone thought to look closely, there was nothing left to see above ground at all. The 1842 mapping is now the primary evidence that anything was ever there.