They exist, if they exist at all, as faint circular shadows pressed into the grass by the crops growing above them, visible only under the right light, from the right altitude, at the right time of year.

The site at Garrydoolis is one of up to eight possible barrows, a barrow being a burial mound raised over the remains of the dead, often dating to the Bronze Age or earlier, concentrated within a single large field measuring roughly 125 metres north to south and 175 metres east to west. A ring-barrow specifically takes the form of a low central mound enclosed by a circular ditch and bank. The Garrydoolis example was identified during an aerial photographic survey flown out of Bruff in 1986, when the camera caught what surveyors catalogued as monument Bruff 122.03. A faint circular cropmark, the kind of ghost impression that forms when buried ditches retain moisture differently from the surrounding soil and cause the plants above them to grow at a slightly different rate, was also noted on Ordnance Survey orthophotos taken between 2005 and 2012. The record was compiled by Martin Fitzpatrick and uploaded in April 2021. None of this shows up on the older generations of mapped Irish landscape.

For anyone making their way out to this part of Limerick, the practical reality is that there is very little to see on the ground. The monument sits in improved pasture approximately 190 metres west of the townland boundary, with no surface features that would distinguish it from the surrounding field to the naked eye. Cropmarks of this kind are best observed from the air during dry summers, when soil moisture differences are most pronounced, which is precisely how the site was located in the first place. A visit on foot is more of an exercise in imagination than observation, standing in a working field and knowing that somewhere beneath the grass, the geometry of an ancient enclosure may still be intact, unrecorded on any map until a survey aircraft happened to pass overhead nearly forty years ago.