The circular earthen enclosure that once defined this rath, a type of enclosed farmstead used throughout early medieval Ireland, was levelled around 1975, leaving only faint undulations in the grass as evidence that anything was ever there. What makes the site quietly compelling is precisely this erasure: a place that persisted on maps across three successive editions of the Ordnance Survey six-inch series, carefully marked with hachures indicating a circular enclosure, and then simply ceased to exist above ground within living memory.

Ringforts were the dominant form of rural settlement in Ireland from roughly the fifth to the twelfth centuries, typically consisting of a circular area enclosed by one or more earthen banks and ditches. Thousands survive across the country, but many others have been lost to agricultural improvement, particularly during the mid-twentieth century when land clearance accelerated. The Shantullig example followed that pattern. What survives, however, is something less visible and considerably more unusual: a souterrain in the southern half of the interior. Souterrains are artificial underground passages or chambers, usually constructed from drystone walling and roofed with large slabs, and were commonly associated with ringforts. Their precise function is still debated, with theories ranging from food storage to refuge in times of threat. The above-ground enclosure may be gone, but whatever lies beneath the pasture at Shantullig has not been so easily erased.