It measures just ten metres in diameter, and its defining wall has long since collapsed into a low, sod-covered ridge, rising no more than thirty centimetres above the surrounding ground. Here and there, small jags of stone push through the turf, the only outward sign that something deliberate was once constructed here. The Burren does not make things easy to read at ground level, and this is a place that only became visible as a monument when aerial photography picked it out in 2015.

The townland name, Termon, is itself a clue to older significance. The word derives from the Irish tearmann, meaning sanctuary or church land, typically ground set aside under ecclesiastical protection in early medieval Ireland. Whether this small enclosure has any direct connection to that ecclesiastical history is not recorded, but the naming of a place carries memory long after the physical evidence has flattened into the landscape. The enclosure sits within the characteristic karst terrain of the Burren, where the underlying limestone lies so close to the surface that the interior of the structure is uneven and slightly tilted to the west, shaped as much by the rock beneath as by any human intention. The wall itself, now roughly 1.4 metres thick where it can be measured, would originally have been a dry-stone construction, the kind of boundary that once defined a domestic, agricultural, or ceremonial space, though which of those purposes it served here is unknown.