This is a barrow, a type of burial mound used across Ireland and Britain from the Neolithic through the Bronze Age, though in this case what survives is modest: a roughly circular area of about five metres in diameter, defined by a low, poorly preserved earthen edge that barely rises above the surrounding pasture.

The feature was not identified at ground level but from the air, spotted on an Air Corps aerial photograph taken on 2 September 1959. That kind of discovery is a reminder of how much of Ireland's early monumental landscape remained unrecorded well into the twentieth century, visible only when shadows and crop marks conspired to betray what centuries of farming had otherwise obscured. The barrow sits on the northern edge of the interior of one enclosure, with a second enclosure immediately to the east, suggesting this corner of Moanmore once held a cluster of related activity, though the relationship between the features is not fully understood. The earthen scarp edge, where it can be made out, is roughly two metres wide and only about five centimetres high, making this one of the more ephemeral examples of a monument type that elsewhere can present as a substantial raised mound.