On the higher ground at the island's south-eastern end, the shape of a graveyard wall has quietly preserved the memory of something older. The boundary wall curves in a distinctly oval form around the south side of St. Loman's oratory, and that curve is significant. Oval or sub-circular enclosures of this kind are a recognised hallmark of Early Christian ecclesiastical sites in Ireland, enclosures that would once have defined a sacred precinct, separating the monastic or religious community from the world outside.

The oval graveyard boundary is not the only trace. A low earthen bank, a slight rise of earth and stone running around the island's perimeter, may once have served as an outer enclosure wall. No dressed facing stones survive, and nothing is definitively structural, but the combination of the shaped graveyard boundary and the peripheral bank has led researchers, including L. Swan writing in 1988, to read the island as a probable Early Christian ecclesiastical enclosure. St. Loman is associated with early Christianity in the Westmeath region, and an island setting would have been entirely in keeping with the early medieval preference for liminal, bounded places, islands especially, as sites for religious communities.