In the townland of Umrygar in County Wicklow, there is an enclosure that exists, to all practical purposes, only on paper. Standing at the site today, there is nothing to see; the ground gives no indication that anything is there at all.

What is known comes from the 1838 Ordnance Survey six-inch map, one of the most systematic cartographic undertakings in Irish history, which recorded the country in extraordinary detail at a time when many early features were still legible in the landscape. On that map, a small circular or sub-circular enclosure appears, roughly 35 metres at its widest point. Enclosures of this general type are among the most common archaeological forms in Ireland, ranging from early medieval farmsteads, known as raths or ring-forts, to prehistoric settlement sites, though without excavation it is rarely possible to say which category any particular example belongs to. Whatever this one was, it was already reduced enough by the mid-nineteenth century that the surveyors could record its outline but later generations would lose it entirely. The gently undulating ground around it, level enough at the specific spot, apparently offered no natural protection against the slow erasure of ploughing, drainage, or simple time.