This medieval earthwork consists of a raised circular platform, measuring 37 metres across from north to south, which would have once supported timber buildings and defensive structures. The platform is defined by a steep scarp that drops between one and three metres to a distinctive water-logged ditch below.

The defensive ditch, or fosse as it’s known in archaeological terms, runs around the entire perimeter of the platform except for a single entrance on the eastern side. This flat-bottomed feature measures 4.5 metres wide and varies in depth from half a metre to 1.5 metres, and today remains waterlogged; a feature that would have enhanced its defensive capabilities in medieval times. The entrance itself is particularly interesting, consisting of a stone-lined causeway 3.2 metres wide that provided the only access across the defensive ditch.

Archaeological investigation has revealed traces of mortared wall footings protruding from the scarp on both sides of the causeway entrance. These remnants likely represent the foundations of a gatehouse or other entrance fortifications that would have controlled access to the ringwork. Such ringwork castles were typically built by the Anglo-Normans in the decades following their arrival in Ireland in the late 12th century, serving as fortified residences and administrative centres for newly conquered territories.