That alone makes this a somewhat melancholy site: a monument to early Christian organisation in the west of Ireland, now sliced in two by the infrastructure of a later age, and further eroded by the field boundaries that have crept across it from almost every direction.

The enclosure at Farrannabox is oval in plan, measuring roughly 250 metres north to south and 175 metres east to west, placing it among the larger examples of its type in the region. An ecclesiastical enclosure of this kind, a roughly circular or oval boundary defining a sacred precinct around a church and its associated settlement, was a standard feature of early medieval Irish Christianity. What survives here is fragmentary. A bank about two metres wide, faced with a stone wall, remains visible at the north-northeast, but much of the rest has been absorbed into the agricultural landscape over centuries. Within the original interior there is evidence of a holy well, a spring or water source venerated for religious or curative properties, often associated with an early saint or founding figure of a monastic community. There is also some indication, according to local archaeological knowledge, that a church once stood here, though its traces are slight.

Tuam itself was one of the most significant ecclesiastical centres in medieval Connacht, the seat of an archbishopric, and the presence of a substantial enclosure on its outskirts is consistent with the kind of satellite religious activity that gathered around important church towns. Whether the site at Farrannabox predates, overlaps with, or is related to Tuam's better-known ecclesiastical history is not clearly established, which is part of what makes it quietly interesting. It sits at the margin in more than one sense, geographically on the edge of the town, and historically on the edge of what is currently known.