The enclosure is subcircular, roughly 14.7 metres north to south and 12 metres east to west at its top, with sides that drop almost vertically, falling around 1.3 metres on the western edge and a considerable 3 metres on the eastern side. That asymmetry is part of what makes it quietly arresting: this is not a gentle mound but something that commands its ground, overlooking the river below from a naturally defended position.

Enclosures of this kind, circular or subcircular raised platforms defined by banks or ditches, appear widely across Ireland and are often associated with early medieval settlement, though many remain undated without excavation. At Belville, the remnants of a bank survive along the western perimeter, roughly 0.8 metres wide, suggesting the platform was once more clearly bounded. The 1837 edition of the Ordnance Survey six-inch map already recorded the feature as a circular enclosure, which tells us it was recognisable and distinct enough to be mapped in the early nineteenth century, even if its origins almost certainly reach back much further. Along the southern edge of the flat top, a more recent stone wall runs on a roughly east to west axis, serving as a barrier between the platform surface and the cliff drop below. A farm track passes along the northern side, meaning the enclosure has been quietly incorporated into the working rhythms of the landscape around it for a long time.