This one, in a grazing field at Raheennamadra in County Limerick, is invisible from the ground. What lies beneath the grass only becomes legible from the air, where the buried remains of an earthwork show up as cropmarks, the faint but readable colour differences that appear in a growing crop or pasture when ancient ditches or banks buried beneath the soil affect how plants absorb moisture. The outline at Raheennamadra is a double one: two rectangular enclosures, conjoined, sitting just north of an east-west stream.

The site was first recorded not through any dedicated archaeological survey, but incidentally, when Bórd Gáis Éireann was photographing the route of its Curraleigh West-Limerick gas pipeline. An aerial photograph taken on 11 September 1982, at a scale of 1:10,000 and catalogued as BGE No. 75, captured the cropmark for the first time. The monument does not appear on any of the historic Ordnance Survey Ireland maps, which suggests it had been unrecognised as an archaeological feature until that accidental aerial pass. Later imagery confirmed the detail further. A Digital Globe orthoimage taken between 2011 and 2013 shows the northern enclosure measuring roughly 40 metres north-west to south-east and 36 metres north-east to south-west, defined by a ditch. A second, slightly smaller enclosure lies to the south-east, approximately 30 metres by 40 metres, and a relic field boundary, one of those fossilised property lines that sometimes survive in the landscape long after the fields themselves have been reorganised, cuts across the north-eastern corner. Additional ASI aerial photographs from October 2002 and January 2003 are also on record. The wider landscape holds other traces of the past: a standing stone lies 110 metres to the south-west, and Clogher Hill sits roughly 190 metres to the north-north-west.

There is no formal public access to this site and nothing to see at ground level; the pasture gives no indication of what lies beneath. The most useful way to examine the earthwork is through Google Earth, where the conjoined rectangular cropmarks are clearly visible and provide a reasonable sense of the scale and layout. Anyone exploring the area should note the nearby standing stone, which is a recorded monument in its own right and offers at least one tangible, visible feature in an otherwise unremarkable-looking stretch of south Limerick farmland. The record was compiled by Fiona Rooney and uploaded to the Archaeological Survey of Ireland database in August 2021.