This rectangular earthwork, measuring roughly 35 metres north to south and 30 metres east to west, is defined by a substantial bank made from earth and stone. The bank itself is quite impressive; flat-topped and ranging from 2.5 to 3.5 metres wide, it rises between 1.5 and 2 metres above the surrounding landscape on its outer edge, whilst the interior height varies from 0.3 to 1 metre.

The enclosure shows signs of wear, particularly along its northern section, though most of the defensive bank remains well preserved. A narrow gap, just 1.7 metres wide, breaks through the eastern bank and likely served as the original entrance. Within the southwest corner of the interior, archaeologists have identified what appears to be the stone footings of a rectangular structure, measuring approximately 2.5 by 3.3 metres; probably the remains of a medieval dwelling. These modest dimensions suggest a single-room building, typical of rural settlement sites from this period.

The defensive ditch, or fosse, that once surrounded the site has long since been filled in, though the waterlogged conditions observed during archaeological surveys hint at why this particular spot may have eventually been abandoned. Such moated sites were common across medieval Ireland, particularly from the 13th to 15th centuries, serving as fortified farmsteads for Anglo-Norman settlers or Gaelicised families who adopted their building practices. The combination of defensive earthworks and domestic structures at Carrowea represents a typical example of these rural strongholds that once dotted the Irish countryside.