This square-shaped enclosure at Rathmoy measures roughly 35 metres north to south and 37.5 metres east to west, defined by a substantial earth and stone bank that still stands up to 1.2 metres high on its outer face. The bank itself is about 3 metres wide, and keen observers can spot traces of what was once an external fosse, or defensive ditch, that would have provided an additional layer of protection to whoever occupied this site centuries ago.

The raised platform within the enclosure suggests this was likely a moated site, a type of medieval settlement particularly common in Ireland during the 13th and 14th centuries. These sites were typically built by Anglo-Norman colonists or Gaelicised Norman families as defended homesteads, combining residential and agricultural functions with defensive features. The absence of any visible entrance today makes it difficult to determine exactly how people would have accessed the interior, though such features often become obscured over time through agricultural activity and natural erosion.

Just to the north lies another possible moated site, suggesting this area of the Fishmoyne river valley was once home to a cluster of these defensive settlements. The location on the floodplains would have provided fertile agricultural land whilst the river offered both a water source and a natural barrier on at least one side. These earthworks represent a fascinating layer of medieval Irish history; physical remnants of a time when local lords needed to balance farming prosperity with the very real need for defendable homes in an often unsettled landscape.