The enclosure measures just over twelve and a half metres across, making it modest in scale but precise enough in its geometry to be clearly deliberate. What makes it slightly puzzling is its hybrid construction: the northern arc is defined by a scarp, essentially a cut or shaped drop in the ground about 1.6 metres high, while the remaining arc uses an earthen bank standing around 1.2 metres. The two techniques meet and together complete the ring, with a gap roughly five metres wide opening to the south-south-west, most likely an original entrance. A shallow depression along the western exterior may be the remnant of a fosse, the ditch that would once have accompanied the bank and added to the enclosure's definition.

Enclosures of this kind are a recurring feature of the Irish rural landscape, and their purposes varied considerably. Some were raths or ringforts, the enclosed farmsteads of early medieval Ireland, typically dating from roughly the fifth to the twelfth centuries. Others served as animal pounds, ceremonial spaces, or burial grounds. Without excavation it is rarely possible to say which function any particular example served, and Dromdrasdil offers no obvious clues from the surface alone. The interior slopes downhill toward the north, which would have made drainage a practical consideration for whoever used the space. The earthen bank has been further obscured over time by field clearance stones dumped along it, the accumulated tidying of generations of farmers working the surrounding land.