In reclaimed pasture near the townland boundary between Ballinlee and Ballingayrour in County Limerick, there is an earthwork that does not appear on any Ordnance Survey historic map. It has no official name, no marker, and no particular reputation. What it does have is a shape, roughly sub-rectangular, measuring approximately 38 metres north to south and 40 metres east to west, defined by a fosse, the term for a ditch or trench used to enclose or demarcate a space, that is interrupted at its northern and south-eastern edges by later field boundaries.

The monument was first identified not through any deliberate archaeological survey but as a side effect of infrastructure work. Aerial photographs taken on 11 September 1982, catalogued as BGE 1/50000 52 and commissioned as part of the Bórd Gáis Éireann Curraleigh West-Limerick gas pipeline project, captured the site from above. When researcher Martin Fitzpatrick examined those images alongside an Ordnance Survey orthophoto taken between 2005 and 2012, and a Digital Globe orthoimage from 2011 to 2013, the fosse became legible. On Google Earth orthoimages it is visible as a faint cropmark, the phenomenon by which buried features influence the growth of surface vegetation, leaving subtle differences in colour or density that only register clearly from altitude.

Because the monument does not appear on historic maps and has not been excavated, its age and function remain open questions. The sub-rectangular form and surrounding fosse are consistent with a range of monument types found across Ireland, from early medieval enclosures to later agricultural or defensive features, but without further investigation it would be unwise to say more. Visiting the site requires attention to where it actually sits, in reclaimed pasture roughly 150 metres east of the Ballingayrour townland boundary. The cropmark is unlikely to be visible from ground level, particularly in dry summer conditions when the grass grows more uniformly. The notes compiled by Fitzpatrick, uploaded in May 2021, suggest the best way to engage with this monument is through the aerial and satellite imagery rather than a walk across a field.