In a corner of undulating pasture at Doonbreedia in County Mayo, overlooking a stretch of rough, wettish ground to the west, there is an enclosure that can be found only on paper. No earthwork, no bank, no depression in the soil betrays its presence. The northwest corner of a modern rectangular field, bordered by a road, gives nothing away.

The evidence for what once stood here comes from the first edition Ordnance Survey six-inch map, surveyed in 1838, which recorded a circular enclosure roughly twenty metres in diameter, comparable in scale to a ringfort. A ringfort, to use the common term for what would more precisely be called a rath, is a type of enclosed farmstead typically dating from the early medieval period, defined by one or more earthen banks and ditches. The Doonbreedia enclosure was mapped once and then vanished from subsequent editions, suggesting it had already been levelled or ploughed out by the time later surveyors passed through. Local tradition adds a further layer: there is said to have been a burial site at or very close to this location. Two hundred metres to the northeast, a rath survives as a separate monument, a reminder that this corner of Mayo was once considerably more occupied and organised than the quiet pasture now suggests.