This one is visible only from the air, a circular ghost pressed into the soil of a low-lying field in County Limerick, betrayed not by stone or mound but by the way crops grow differently above disturbed ground. A ring-barrow, in general terms, is a prehistoric funerary monument consisting of a central burial mound enclosed by a circular ditch and sometimes an outer bank. What survives here is not the raised form itself but the memory of that shape, recorded as a cropmark roughly eight metres in diameter.

The monument in Garrison townland was first identified during the Bruff aerial photographic survey in 1986, when the circular outline showed up in survey image Bruff 262. It was not something that could have been spotted on the ground, sitting as it does in poorly drained pasture crossed by land drains and watercourses, and it has never appeared on Ordnance Survey Ireland historic maps. A second ring-barrow, recorded separately as LI024-261, lies approximately 95 metres to the north-west, suggesting this corner of south County Limerick once held a cluster of funerary activity. The site sits just 15 metres east of the townland boundary with Pallas, a marginal position that may reflect something about how ancient communities marked or used the edges of their territories, though the notes offer no firm interpretation on that point. The monument was still visible as a cropmark on a Google Earth orthoimage captured in November 2018, compiled for the record by Alison McQueen and Vera Rahilly and uploaded in October 2020.

There is nothing to see at ground level in the conventional sense. The field is working agricultural land, wet and cut through with drainage channels, and the circular feature exists essentially as data, something confirmed through aerial photography and satellite imagery rather than physical inspection. The nearby ring-barrow to the north-west is the recorded companion monument, and together they point to a prehistoric landscape that has been almost entirely swallowed by centuries of farming and drainage. Anyone researching the area would do better to start with the aerial survey records and the National Monuments Service database than to look for surface traces in the field itself.