This one in Oldtown, in the Bennett townland of Co. Limerick, does almost nothing of the sort. It exists, for most practical purposes, as a ghost in the grass, a rectangular outline legible only from the air, its edges absorbed into wet pasture beside the River Mahore. It does not appear on any Ordnance Survey historic maps, which means it slipped past the surveyors entirely, or had already vanished from the visible landscape long before they arrived with their instruments and notebooks.

What is known about it comes almost entirely from aerial observation. An enclosure of this type is exactly what the word suggests, a defined area of ground enclosed by a boundary, most likely a bank, ditch, or combination of both, though the specific form here remains uncertain. When aerial photographs were taken in May 2003 as part of the Archaeological Survey of Ireland, the rectangular shape became apparent as a cropmark, the kind of faint differential growth in vegetation that betrays buried features beneath the soil. A post-1700 field boundary running north to south cuts across the western edge of the monument, a reminder that later agricultural activity has been quietly rearranging the landscape around and through the older one for centuries. A possible ditch-barrow, a circular monument typically consisting of a low mound enclosed by a ditch, sits roughly 20 metres to the east, raising the question of whether the two features were ever related. Further cropmark evidence appeared on Ordnance Survey orthophotographs taken between 2005 and 2012, and on Google Earth imagery, each image offering a slightly different glimpse of the same buried outline.

There is no marker, no signage, and no formal access to this site. The land is wet pasture, which means the ground underfoot is likely soft and uneven for much of the year. The cropmark itself is far more visible in dry summers, when moisture stress causes the vegetation above buried ditches or banks to respond differently to that over undisturbed ground. A visitor without access to the relevant aerial photographs would have little to go on at ground level. The site is most usefully approached through the publicly available Ordnance Survey Ireland historic mapping and the National Monuments Service database, where the monument is recorded, rather than in person. Its interest lies less in what can be seen standing in the field than in what it represents, a piece of the landscape that remained invisible to official record until someone happened to look down from above at the right moment in the right season.