Somewhere in the marshy grassland above the bogland of south Galway, a ringfort once stood, its banks and ditches substantial enough to be recorded by Ordnance Survey cartographers in 1838. Today the ground offers no visible trace whatsoever.

A ringfort, or rath, is an enclosed farmstead of the early medieval period, typically defined by one or more circular earthen banks, and they were once among the most common man-made features in the Irish landscape. The Kilquain example was mapped in 1838 as a roughly circular enclosure of around 28 metres in diameter. When surveyors returned between 1912 and 1916 to produce the more detailed 1:2500 Ordnance Survey plan, the enclosure appeared slightly different, recorded as an oval measuring approximately 31 metres north-northeast to south-southwest and 21 metres east to west. That discrepancy between the two surveys is not unusual; early cartographers sometimes generalised shapes, and later surveys captured finer detail. What the later plan also noted was a short line of hachures, a cartographic convention used to indicate a slight slope or earthwork, running some 16 metres to the northwest of the main enclosure. This suggests there may have been an additional feature adjoining the rath, perhaps a small annex or external bank, though nothing of it remains either. The surrounding marshy grassland, edging onto bogland, is itself significant; wet ground has a complicated relationship with archaeological survival, sometimes preserving organic material exceptionally well, sometimes accelerating the erosion of earthworks through waterlogging and agricultural drainage over centuries.