A ringfort, or rath, is a roughly circular enclosure built from an earthen bank, used as a farmstead during the early medieval period in Ireland. Thousands survive across the country, but this one in Sluggary has been quietly disappearing for well over a century, and the maps are the clearest evidence of that decline.

When the Ordnance Survey recorded the area on its six-inch map of 1840, the site appeared as a complete circular enclosure, approximately twenty metres in diameter. By the time the same series was revised in 1924, only an arc of that enclosing element remained, suggesting significant deterioration within those intervening decades. The site sits on unused ground roughly twenty metres west of the Limerick to Tralee railway line, a corridor of infrastructure that reshaped the surrounding landscape from the mid-nineteenth century onwards. Whether the railway's construction contributed to the fort's deterioration is not recorded, but the proximity is difficult to ignore. The notes were compiled by Denis Power and uploaded in March 2013.

For anyone curious enough to seek it out, the surviving arc measures approximately eight metres north to south, though it is now heavily obscured by dense scrub vegetation and builder's rubble. There is very little to see without considerable effort, and the undergrowth makes close inspection difficult. The site is not managed or marked, and there are no formal access arrangements. Its value at this point is less as a visible monument and more as a reminder that the record of a place, the 1840 map in particular, can outlast the physical thing itself.