It is classified as a promontory fort, a type of enclosure that typically exploits a coastal headland or cliff edge, using the natural terrain to do much of the defensive work. But this one is inland, which places it in a smaller and less understood category of monument. Inland promontory forts use a spur of land between two converging valleys, a river bend, or some other natural feature to achieve a similar effect without the sea. The result is an enclosure that feels borrowed from one landscape and quietly transplanted into another.

Promontory forts in Ireland are generally associated with the Iron Age, though many were likely reused or modified across long periods. The inland variety tends to attract less attention than their coastal counterparts, partly because the drama of the setting is more subdued, and partly because they are often difficult to date without excavation. The place name Rinagall is itself of some interest: the Irish "rinn" typically refers to a point or headland, which suggests the topography here was recognised and named long before any modern classification was applied to it. Beyond the classification and the place name, the documentary record for this particular site is thin, and specifics about its construction, date, or the community that built it remain, for now, out of reach.