This medieval earthwork forms a rectangular enclosure measuring 43 metres north to south and 40 metres east to west, defined by substantial earthen banks that stand between 0.6 and 0.9 metres high on the interior and span 4 to 6 metres in width. The corners of the enclosure are notably raised, and the entire structure is surrounded by flat-bottomed moats that measure 5.5 to 6.5 metres wide, with an internal depth of 1.5 metres and an external depth of 0.5 to 0.7 metres.

Access to the enclosure was provided through an entrance gap on the western side, where a causeway approximately 5 metres wide crosses the moat. The site has become overgrown over the centuries, but its distinctive defensive features remain clearly visible in the landscape. Just 40 metres to the south lies a burnt mound, catalogued separately as WX020-060, suggesting this area saw multiple phases of human activity throughout prehistory and the medieval period.

Moated sites like this one at Killabeg were typically constructed during the Anglo-Norman period in Ireland, serving as fortified farmsteads for colonising settlers. These earthworks provided both defensive capabilities and drainage in low-lying areas, whilst also serving as status symbols for their inhabitants. The site was first documented by Barry in 1977 and later included in the Archaeological Inventory of County Wexford published in 1996, with subsequent research continuing to shed light on these fascinating medieval landscapes.