What makes it quietly compelling is not what it is, exactly, but what has happened to it: a railway line, running north-east to south-west, has sliced through its south-eastern edge, leaving only a portion of what was once a complete circular form. The monument survives as a kind of accidental archive, partly erased by Victorian infrastructure and left to merge with the surrounding farmland.

The Ordnance Survey's first edition six-inch map of 1840 recorded the feature as a circular earthwork, the sort of annotation that appears across Irish historic mapping wherever surveyors encountered raised ground of apparent antiquity. Earthworks of this general type, which can range from ringforts used as enclosed farmsteads in the early medieval period to later enclosures of various functions, were common enough across the Irish landscape that many were recorded without further classification. By the time the twenty-five-inch map was produced in 1897, the picture had changed considerably. The earthwork was now shown as a raised semi-circular area, measuring roughly twenty-four metres on its north-east to south-west axis and thirteen metres on its north-west to south-east axis, the railway having already truncated whatever lay to the south-east. The line had effectively fossilised the remaining portion in place, cutting off further agricultural disturbance on one side while the rest of the field was turned over to pasture.

The monument sits in Thomastown townland within the barony of Coshma, and while it does not appear as a dramatic feature on the ground, its outline remains detectable on satellite imagery captured between 2011 and 2013, as well as on Google Earth orthoimages, where the subtle rise of the surviving arc can be picked out against the surrounding field surface. Visiting requires some patience with rural navigation and appropriate permission to access private farmland. The area offers no formal access or signage, and the feature itself is overgrown rather than cleared. Those with an interest in historic mapping might find it rewarding to compare the 1840 and 1897 Ordnance Survey sheets with the current landscape, watching how the railway's arrival reshaped not just the land but the cartographic record of what had been there before.