This is a rath, the Irish term for a ringfort, the most common type of early medieval settlement in the Irish countryside. Typically dated to between the sixth and tenth centuries, raths were enclosed farmsteads, their banks and ditches offering a degree of security for a family and their livestock rather than serving any serious military purpose. What makes the one at Moig East worth pausing over is the particular clarity of its double-bank construction and the long view north it commands across the Shannon estuary.

The site takes the form of a circular enclosure roughly fifty-five metres in diameter. Two earthen banks run concentrically around the interior, separated by a fosse, a flat-bottomed ditch, about two metres wide. The inner bank survives to an external height of over two metres on its west-south-western arc, which is its best-preserved section. The outer bank is lower and more ambiguous; its flat top and sheer sides are so similar in appearance to the field boundary that abuts it to the north-west that it may, at some point, have been repurposed as one, the ancient boundary absorbed into a later farming landscape. A low causeway at the south-south-west provides the original entrance, aligning gaps in both banks, each a little under three metres wide. A separate break in the inner bank to the east-south-east is almost certainly a cattle gap introduced by later agricultural use, widened to two metres for the passage of animals.

The interior is flat but heavily overgrown with brambles, which makes close inspection difficult for much of the year. Those willing to look carefully at the south-eastern quadrant may notice faint linear ridges running across the ground; these are likely the traces of cultivation ridges, suggesting that at some point the enclosed area was turned over to tillage. The fosse remains well preserved around most of the circuit, though it is clogged with organic debris towards the south-east. The site sits in active farmland, so access requires awareness of livestock and land boundaries. The northern aspect rewards the walk up regardless of season, with the Shannon estuary opening out in the middle distance in a way that would have made this particular hilltop feel significant to whoever first raised the banks here.