The central feature is a grass-covered mound rising 4.5 metres high, with a flat top measuring roughly 4 metres north to south and 5.7 metres east to west. The base spans approximately 23 metres in diameter, with steeply sloping sides that appear even more dramatic on the western edge where the natural terrain drops towards the water. A defensive ditch, or fosse, encircles the mound except along the western arc where the earthwork meets the shoreline directly. Rock outcrops are visible breaking through the fosse on the northeastern side, whilst a flat-topped external bank, standing 3.6 metres wide and varying in height, runs from the northwest to the north-northeast.

Just south of the main mound lies a roughly rectangular platform, measuring 12.5 metres north to south and 15 metres east to west, which likely served as a bailey; the enclosed courtyard area typical of these fortifications. This platform is defined by fosses along its northern and southern boundaries, though the southern ditch is less pronounced, and by a steep scarp on its western side. The eastern boundary remains indistinct, perhaps eroded over the centuries. Archaeological surveyors have also noted mysterious lines of submerged boulders visible at the shoreline immediately north of the mound, though their purpose and relationship to the castle remain unclear.

The combination of the mound’s distinctive shape and the attached platform strongly suggests this was once a small earthwork castle, likely constructed by Anglo-Norman settlers in the 12th or 13th century. These motte and bailey fortifications were quick to build using local labour and materials, providing both a defensive stronghold and a symbol of authority over the surrounding landscape. Today, this peaceful lakeside monument offers visitors a tangible connection to Ireland’s turbulent medieval past, when such fortifications dotted the countryside as new powers sought to establish control over ancient territories.