This one, in rough wet pasture in Ballincurra, County Limerick, does almost the opposite. It has been so thoroughly levelled into the ground that it left no trace on any Ordnance Survey historic map, and the only way to see it at all is from the air, in the right light, at the right season, when differential crop growth betrays the ghost of something rectangular beneath the surface. Cropmarks of this kind appear when buried ditches or disturbed soil cause crops above them to grow at a slightly different rate or colour to their surroundings, offering a fleeting aerial signature of structures that have long since disappeared at ground level.

The enclosure was first identified during the Bruff aerial photographic survey in 1986, recorded as image 234 in that survey, when the outline of a rectangular earthwork became visible in the north-west corner of a field. Subsequent satellite imagery confirmed what that survey had caught. Orthoimages captured between 2005 and 2012 by Ordnance Survey Ireland, Digital Globe images from 2011 to 2013, and a Google Earth image dated 4 April 2013 all show a faint rectangular cropmark measuring roughly 20 metres east to west and 15 metres north to south. The site sits immediately east of a watercourse that also serves as the townland boundary with Ballynamona, placing the enclosure right at an ancient administrative edge. Approximately 120 metres to the north-east and south-east lie a ditch-barrow and a separate earthwork, suggesting a wider cluster of activity in this low-lying landscape. Further aerial analysis indicates that a larger rectangular area in the adjoining field to the north, defined by two linear cropmarks enclosing its northern and eastern sides, is likely a continuation of the same monument, bringing the total footprint to roughly 22 metres by 21 metres. The record was compiled by Alison McQueen and Vera Rahilly and uploaded in November 2020.

There is little to see on the ground, and that is rather the point. The field remains rough, wet pasture, and the enclosure itself is effectively invisible without aerial perspective or a good knowledge of what the satellite images show. The watercourse to the east provides a useful orientation marker if you are trying to locate the general area, and the north-west corner of the field is the focus. Visiting in a dry summer, when cropmarks are most likely to be pronounced, would give the best chance of noticing any surface variation, though even then the traces are faint. This is a site that rewards looking at a screen as much as standing in a field.