No signpost marks it, no entry on the Ordnance Survey historic maps acknowledges its existence, and the surrounding landscape offers little obvious reason to stop and look. Yet beneath the ordinary surface of this ground in the townland of Doonmoon, something deliberate and old holds its shape, roughly 32 metres north to south and 25 metres east to west, a sub-circular earthwork that has persisted quietly through centuries of agricultural change.

The feature came to formal notice not through fieldwork or excavation but through an aerial survey conducted on 3 November 1984, when cameras mounted for the Bórd Gáis Éireann Curraleigh to West Limerick gas pipeline project photographed the area as part of a pre-construction archaeological assessment. The images, recorded at a scale of 1:5000 and catalogued as Strip Map 4, Site 4/24, revealed the raised ground clearly enough to identify it as a distinct monument. An earthwork of this kind, a term used broadly for any feature shaped from soil and earth rather than stone, could represent the remains of a ringfort, a type of enclosed farmstead common across early medieval Ireland, though the record does not venture a specific interpretation. What later satellite imagery confirmed, including a Digital Globe orthoimage from 2011 to 2013 and a Google Earth image dated 19 April 2019, is that the northern edge of the earthwork is intersected by a relic watercourse running east to west, a dried or diverted channel that likely predates the surrounding land reclamation. The record was compiled by Fiona Rooney and uploaded to the national monuments database in June 2021.

The site sits approximately 180 metres south of the townland boundary with Elton. Because it lies in private agricultural land and carries no public marker, access would require landowner permission. The earthwork is most legible from above, as the aerial photographs demonstrate, but at ground level the raised profile of the ground may still be perceptible, particularly after rain when subtle changes in drainage can pick out old features in a field. The relic watercourse at the northern edge is worth looking for as a secondary indicator of the site's extent and age.