This one, a rectangular earthwork buried within a conifer plantation in the townland of Island Dromagh, County Limerick, offers nothing so accommodating. It has no visible surface remains, no marker on the Ordnance Survey's historic maps, and its existence is known almost entirely because a gas pipeline happened to pass nearby four decades ago.

The site came to light through an aerial photograph taken on 3 November 1984, during survey work for the Bórd Gáis Éireann Curraleigh West to Limerick gas pipeline. Aerial survey of this kind, conducted at low altitude to document the ground along a proposed pipeline corridor, has been responsible for identifying a significant number of previously unrecorded Irish monuments, particularly earthworks that are invisible at ground level but cast faint shadows or leave crop marks legible from above. The photograph in question, catalogued as BGE 1/5000 2571, Strip map 4, site 4/35, showed the rectangular earthwork lying to the south of a separate enclosure recorded as LI040-135. That enclosure sits approximately 50 metres south of a watercourse marking the townland boundary with Hammondstown to the northeast. Subsequent examination of Digital Globe and Google Earth orthoimages has confirmed that nothing now shows at the surface. The record was compiled by Fiona Rooney and uploaded to the national monuments database in June 2021.

For anyone curious enough to visit, the site lies within a working conifer plantation, which means access may be restricted or impractical depending on forestry activity, and the dense canopy is precisely the kind of environment that obliterates any residual earthwork humps or ditches that might otherwise catch low winter light. The watercourse along the Hammondstown townland boundary provides a rough navigational reference. In practical terms, what a visitor is really looking at is an absence, a place where something once shaped the ground and has since been absorbed entirely back into it. The aerial photograph remains the only direct evidence, and that photograph is held in archive rather than on display anywhere nearby.