A shallow fosse, roughly seven metres wide, curves gently from east to west, accompanied by an external bank two metres across and a further outer fosse four metres wide. Taken together, these earthworks trace the probable outline of an ecclesiastical enclosure, the kind of roughly circular or oval boundary that once defined the sacred and functional territory of an early Irish religious settlement. Such enclosures typically surrounded a church, burial ground, and associated structures, forming a boundary between the spiritual world within and the secular world without. What makes Ennereilly quietly interesting is that the graveyard itself is the obvious survivor, while these earthworks to its north suggest something larger once existed here, a wider precinct now reduced to a barely legible crease in the landscape.

The surviving earthworks represent only part of what may have been an outer enclosure, implying that the original monastic or ecclesiastical complex was organised in concentric zones, a common arrangement in early medieval Irish ecclesiastical sites. The innermost area would have held the most sacred ground, with outer rings accommodating less ritually significant activity. At Ennereilly, the graveyard preserves one layer of that arrangement, while the fosse and bank to the north preserve, partially and ambiguously, another. No specific founding date or patron saint is recorded for this site in the available evidence, but the morphology of the earthworks places it within a recognisable tradition of early Christian settlement in Ireland.