What was once a complete ring is now a D-form, its northern arc shaved away, its geometry interrupted by a modern field wall running east to west. The southern scarp still climbs to around 1.6 metres at its steepest, giving the site its most legible edge, but the overall impression is of something in the process of being absorbed back into the landscape rather than preserved within it.

A rath is an early medieval earthwork enclosure, typically circular, built from a raised bank and used as a farmstead or defended homestead. The Ballyglass example follows that form, though its survival is partial. The 1838 Ordnance Survey six-inch map recorded it as a complete circular enclosure, a clean ring visible from above. By the 1920 edition, the picture had already changed: the cartographers used hachuring to indicate a semi-circular area open to the northwest, suggesting that truncation of the northern arc was well underway by then. The raised platform that remains measures roughly 28 metres north to south and 30 metres east to west, with the interior sloping gently downward toward the south and southeast. At the centre there is a pronounced linear depression, approximately 8 metres long and up to half a metre deep, most sharply defined along its northern edge. Whether this represents the trace of a buried structural feature or is simply the result of later disturbance is not recorded, but it gives the interior a slightly unsettled quality underfoot.

The site sits on elevated ground with open views, particularly to the south, which is consistent with the positioning of many raths whose builders valued visibility across the surrounding land. The field wall that now forms the straight northern boundary makes the D-shape feel almost intentional, though it is simply the result of agricultural convenience overtaking archaeological form over generations.