Recorded on the 1838 Ordnance Survey six-inch map with a diameter of roughly 20 to 25 metres, it had already vanished from later map editions, and today there is no visible trace of it at ground level. What survives is essentially a cartographic ghost, a feature that surveyors in the 1830s considered worth marking but which subsequent generations either could not find or chose to ignore.

The 1838 OS six-inch maps were among the most methodical surveys of the Irish landscape ever undertaken, and features recorded on them, whether field boundaries, earthworks, or enclosures, were generally observed rather than invented. Circular enclosures of this kind are broadly associated with early medieval settlement in Ireland, sometimes surrounding a farmstead or a dwelling of local significance, though without further excavation or documentation it is impossible to say more about the Roos example specifically. What the notes do tell us is that it sat on a slight rise, with the ground falling away to the south-west towards a stream or drain. On the opposite bank of that same drain, to the south, stands a castle, a proximity that may be coincidental or may hint at a longer history of occupation on this patch of ground across different periods.