This one in Portboy, County Limerick, does no such thing. It has been levelled so thoroughly that it leaves no trace on the ground whatsoever, surviving only as a faint oval shadow visible from the air, a cropmark pressed into the improved pasture like a watermark in old paper. What was once a substantial enclosure, roughly 16 metres along its north-west to south-east axis and 14 metres across, is now perceptible only because the buried remains beneath the soil affect how grass and crops grow above them, and even then only under the right conditions of light, angle, and season.

The site was not recognised through any ground-level survey or historical mapping. The Ordnance Survey's historic maps recorded nothing here, and the enclosure does not appear on any of them. It came to light instead through the Bruff aerial photographic survey of 1986, when a faint roughly oval-shaped cropmark was spotted to the immediate north-west of a local farmyard, catalogued as Bruff 230. Subsequent orthoimagery confirmed the finding: the mark appears on Ordnance Survey Ireland imagery taken between 2005 and 2012, on Digital Globe imagery from 2011 to 2013, and again on a Google Earth image captured on 20 March 2018. The enclosure sits in improved pasture, approximately 50 metres north-east of the townland boundary with Ballynamona and 345 metres north-west of the Ballynamona River. Around 335 metres to the north-east lies a cluster of contiguous barrows, low burial mounds that tend to date from the Bronze Age, suggesting this part of south County Limerick held some significance across a long stretch of prehistoric activity. The record was compiled by Alison McQueen and Vera Rahilly and uploaded in November 2020.

There is little for a visitor to see on the ground, and that is rather the point. The field looks like any other patch of managed pasture in this part of Limerick. The interest lies less in what is visible and more in what the site represents about how archaeology is practised today, since the monument would almost certainly remain unrecorded without the aerial survey programme. If you do come out this way, the broader landscape around Bruff repays attention. Looking at the area through satellite imagery beforehand, using the orthoimages that helped identify the site, gives a clearer sense of what you are standing above than anything you will see at eye level.