At Lickadoon in County Limerick, a circular enclosure roughly thirty metres in diameter was recorded clearly enough on the Ordnance Survey's six-inch map of 1840, shown as a tree-covered ring set into the low-lying pasture east of the Ahanload River. By the time the site was formally inspected, there was nothing left to see. It had been levelled, absorbed back into the agricultural landscape around it.

Circular enclosures of this kind are common across Ireland, and their origins vary widely. Some are the remains of ringforts, the enclosed farmsteads of early medieval Ireland where a family and their animals sheltered within a raised earthen bank. Others may be later features, or the remnants of something harder to categorise. The 1840 Ordnance Survey mapping, carried out with considerable care by teams working across the country, captured the enclosure at a moment when it still had visible form, marked by the trees growing over it. Whether those trees were planted deliberately to demarcate the boundary, or had simply colonised an already-abandoned earthwork, the notes do not say. What survives in the record is the shape: circular, modest in scale, occupying a low ridge with open views from the north-west round to the east, positioned just above marshy ground beside the river. The site was compiled by Denis Power and uploaded to the national record in May 2013.

Visitors to this part of Limerick will find the landscape much as the notes describe it: flat, wet, and agricultural, the kind of country where ancient earthworks either survive intact beneath scrub and rushes, or disappear entirely beneath the plough. The Ahanload River runs quietly nearby. There is no marker, no interpretation panel, and no visible trace of the enclosure itself. What the site offers is more of a lesson in absence than a spectacle, a place where knowing what the map once showed makes the empty field more interesting than it would otherwise appear.