Measuring roughly 62 metres along its northeast to southwest axis, the enclosure is defined by a raised bank and an external fosse, which is a defensive ditch dug around the perimeter to reinforce the bank above it. The fosse survives along the southeastern and southern arc of the monument, giving a clear sense of how the structure once presented itself to the surrounding landscape.

The place-name Termon is itself a clue to an older layer of significance. In Irish, tearmann refers to land under ecclesiastical protection, typically territory associated with an early monastic foundation where certain rights of sanctuary applied. Whether this enclosure has any direct connection to such a designation is not certain, but the coincidence of name and monument is worth noting. Hilltop enclosures of this kind are found across Ireland and tend to be associated with the early medieval period, serving purposes that range from settlement and livestock management to ceremonial or defensive use. This one survives in fair condition, though a farm trackway has been cut across it from northeast to southwest, dividing the interior and offering a reminder of how agricultural life has worked around and through these features for centuries without always recognising what lies underfoot.