The enclosure on Annagh Hill is subrectangular in plan, measuring roughly 18 metres north to south and 15 metres east to west, and what marks it out is a scarp, a sharp drop in ground level that traces the perimeter and survives best along the northern and eastern sides. On the northern edge there is also a deep, round-bottomed fosse, a defensive ditch cut into the earth, which suggests this was once a deliberately bounded and protected space. A possible gap in the western side may indicate where an entrance once stood.

Enclosures of this kind are among the more quietly ambiguous features in the Irish archaeological landscape. They can represent farmsteads, small defended residences, or the remains of early medieval ringfort activity, though without excavation it is difficult to assign a confident date or function to any one example. What gives the Annagh Hill site particular interest is its association with a nearby settlement cluster, suggesting that this was not an isolated structure but part of a wider pattern of occupation in the area. The combination of a defined enclosure with an adjacent group of settlement features points to a community that organised itself carefully in this low-lying terrain, using the natural advantage of even a modest rise to mark out and perhaps protect a central space.