This one in Garrysallagh, Co. Westmeath, appeared on the 1837 Ordnance Survey Fair Plan as an oval-shaped enclosure, annotated plainly as 'fort', and then dropped out of every subsequent edition of the OS six-inch series entirely, as though the surveyors thought better of it. It sits on the north face of a small ridge, with a lake just sixty metres to the north and a townland boundary road close to its north-eastern edge, and it shares the immediate landscape with a second ringfort only sixty-five metres to the north-west. That density is not unusual in the Irish midlands, where these earthwork enclosures, typically the enclosed farmsteads of early medieval families, were once scattered thickly across the countryside, but the near-total erasure of this particular example gives it an additional layer of obscurity.

By 1970, when the site was formally described, it was already in poor condition: a sub-circular area measuring roughly thirty-nine metres north-east to south-west and thirty-one metres north-west to south-east, enclosed by the remnants of an earthen bank and an external fosse, the shallow ditch that would originally have reinforced the bank's defensive profile. Along the western arc, from south-south-west around to north-north-west, even that reduced bank had been worn back to little more than a scarp in the ground. What saved the site from complete invisibility was aerial photography. A Digital Globe image taken in November 2011 captured it as a cropmark, the buried remains showing up as differential growth in the vegetation above. The same photograph revealed something potentially more interesting: the cropmark outline of a possible rectangular annexe attached at the north-east, and, immediately to the south, a linear earthwork that may represent a sunken way, a slightly sunken track worn or dug into the ground, often associated with the approaches to enclosed settlement sites.