The shape itself is the first curiosity. Most early enclosures in Ireland are roughly circular or oval, forming the familiar outline of a ringfort, the type of enclosed farmstead that tens of thousands of Irish families occupied from the early medieval period onward. A D-shape suggests either an adaptation to the local terrain or, more intriguingly, a deliberate design whose original purpose is no longer obvious.

The structure is built of drystone walling, a technique requiring no mortar, relying instead on the careful fitting of stones against one another for stability, with larger boulders incorporated at various points throughout. Internally, the enclosure measures 6 metres east to west, while the straight northern to southern side runs to 11 metres. That straight side tells its own quiet story: it has clearly been reused in more recent times and built up to a maximum height of 1.5 metres, meaning that at some point a farmer or landowner found the old wall useful and simply added to it rather than starting again. It is a practical decision that was probably made without much thought, yet it has layered two distinct periods of construction onto a single stretch of stone.