Somewhere within it sits a classified archaeological enclosure, the kind of circular or oval earthwork that turns up across early medieval Ireland, typically forming the boundary of a farmstead, a religious site, or occasionally a place of assembly. The enclosure at Tobermaing is recorded but, at present, little elaborated upon in any publicly accessible form.

Enclosures of this type, often called raths or ringforts when they served a domestic purpose, were built predominantly between roughly the fifth and twelfth centuries, and Ireland has tens of thousands of them, making them one of the most common monument types in the landscape. What makes any individual example worth pausing over is usually its local context: the name of the land it sits on, the other monuments nearby, the way it survives in the field. The well implied by the Tobermaing placename adds a layer of possible significance, since holy wells and enclosures sometimes share a landscape in ways that suggest long continuity of use at a particular spot, a quiet kind of layering rather than any dramatic event. Whether the enclosure and the well tradition are connected here is simply not known from what survives in the record.