Roughly circular in outline, measuring approximately 31 metres north to south and 34 metres east to west, it was recorded on an early map but had already vanished from the revised edition published in 1904 to 1905. Today, the ground above it offers no trace whatsoever; the site sits under tillage, its form erased by generations of ploughing and field clearance.

Enclosures of this kind, typically circular or near-circular earthworks, were once a common feature of the Irish countryside, serving variously as farmsteads, settlement boundaries, or ceremonial spaces across many centuries of prehistory and early medieval life. What makes the Ballynamuddagh example quietly interesting is how its memory has been absorbed into the landscape in a different way. The townland boundary, that administrative line dividing one named territory from another, runs northwest to southeast along the edge of the northeastern quadrant of the enclosure. There is a slight but telling kink in that boundary line, a small deviation that does not follow natural topography and may well preserve the curve of the original earthwork. A field boundary that once lay to the south has since been removed, erasing another potential clue. The enclosure itself appears on an earlier map edition but not the 1904 to 1905 revision, suggesting it had already been levelled or had become unrecognisable on the ground by that point.