Measuring approximately 22 metres northwest to southeast and nearly 11 metres across at its top, this earthwork rises less than half a metre above the surrounding field. A water-filled ditch, or fosse, once encircled the platform, with traces of an outer bank still visible along the northern edges. The bank eventually merges with a large enclosure immediately to the east, whilst a possible causeway crosses the fosse at the southern corner, providing what would have been the original access point to this fortified site.

The monument sits within a remarkable concentration of medieval earthworks that tell the story of Tullaghanbrogue manor. Just 25 metres to the southwest stands a motte, likely the administrative centre of the manor that William de St. Leger held from medieval times right through to the Cromwellian period. The former parish church of Tullaghanbrogue lies about 240 metres to the west, and numerous other earthworks dot the immediate landscape. Writing in 1909, the historian Goddard Henry Orpen noted that foundations of buildings were still traceable northeast of the motte, suggesting this was once a thriving medieval settlement.

The site’s strategic position offered its medieval inhabitants good visibility across most of the surrounding countryside, though rising ground to the east and west, along with hedgerows and modern forestry to the south, now limit the views. A meandering stream once flowed just north of the monument; visible on the 1839 Ordnance Survey map, it was later straightened as part of agricultural improvements. These moated sites typically housed manor houses or farmsteads of prosperous tenants, with the surrounding water-filled ditch serving both defensive and drainage purposes in Ireland’s damp climate.