The enclosure measures roughly 58 metres on its longer northeast-to-southwest axis and 40 metres across, defined by a low, grassed-over stony bank. At the northeast section, traces of deliberate stone-facing remain visible, suggesting that what now reads as a gentle ridge was once a more substantial built boundary.

What makes the site particularly arresting is what occupies the space inside. Two distinct features share the enclosure's interior: a burial ground sits in the northwest quadrant and an altar in the southwest. This pairing, a place of interment alongside what appears to be a devotional structure, points to a long history of sacred use that probably folded older, pre-Christian practice into later religious observance. Enclosures of this kind, roughly oval earthworks defined by a bank rather than a wall, are found across Ireland and often predate the medieval period, though many continued to attract ritual or funerary activity well into Christian times. The name Cahergal itself is anglicised from the Irish, with "caher" typically denoting a stone fort or enclosure, which adds another layer of possibility to the site's origins.