That curve is the kind of detail that most people would walk past without a second thought, but to an archaeologist it signals the arc of an early ecclesiastical enclosure, the roughly circular or oval boundary that early Christian communities in Ireland used to define sacred ground. The bank here measures some 2.4 metres wide and 0.7 metres high, modest dimensions that have nonetheless survived long enough to preserve the memory of a boundary that may be over a thousand years old.

Early ecclesiastical enclosures of this type are found across Ireland, typically associated with the establishment of monastic or church sites from the early medieval period onwards. They were not defensive structures in the military sense but rather markers of sacred space, separating the spiritual community and its burial ground from the secular landscape beyond. The enclosure at Tobertown has been recorded as part of the Archaeological Survey of Ireland, compiled by Geraldine Stout and updated by Christine Baker, with the record uploaded in October 2014. The graveyard itself, catalogued under the reference DU001-003002-, sits in an elevated position beside the road, which would have been a characteristic choice for early church foundations, visibility and accessibility both mattering to communities that depended on the site for burial and worship.

The bank is most evident along the southern and south-eastern sides of the graveyard, which is where the curve that betrays the enclosure's early origins is best observed. It is worth knowing before visiting that the integrity of this section has been compromised somewhat: a house, apparently recently extended at the time of the survey, has been built into this stretch, and a wooden fence has replaced the bank in that immediate area. The archaeological feature is therefore not continuous, and reading it requires a little patience and a willingness to piece together what remains. The elevated roadside position to the west of the village makes the site straightforward to locate, and the surviving earthen bank, where it does remain, is visible without any special access or equipment.