The enclosure measures roughly 40 metres north to south and 28 metres east to west, its walls long since grassed over but still legible as a gentle ridge in the landscape. It is the kind of feature that disappears entirely in certain lights and reveals itself clearly in others, most reliably from above, where aerial photography has confirmed its shape.

What makes the northern edge of this enclosure particularly interesting is a detail of alignment. Rather than following its own irregular curve, the northern wall runs straight, and that straight line corresponds to the townland boundary between Ballyline and Sheshodonnell West. Townland boundaries in Ireland are famously ancient, often preserving divisions of land that predate any documentary record, and the fact that this enclosure's edge appears to have been absorbed into, or perhaps even helped to define, such a boundary hints at considerable age. Roughly 50 metres to the south-east lies Templeline church and its associated graveyard, a pairing that raises the possibility of an ecclesiastical connection. Early Irish church sites were frequently enclosed within a roughly oval or circular boundary, known as a cashel or enclosure, which marked out consecrated ground and provided a degree of physical definition to the monastic or parish precinct. Whether this enclosure at Ballyline relates to that nearby church complex or represents something entirely separate remains an open question.