A watercourse, roughly six metres wide, has cut clean through the site on a north-south axis, carrying away or burying the western portion entirely. What remains on the eastern bank is a semicircle of low earthen bank and shallow ditch, the ghost of an enclosure that was once, by the evidence of a 1924 Ordnance Survey six-inch map, a complete circular structure about thirty-five metres in diameter. That the map shows it whole means the division happened at some point after that survey, or at least that the western half had not yet been fully erased. Either way, the watercourse has since done its work thoroughly.

Ringforts, sometimes called raths, are among the most common early medieval monument types in Ireland, typically dating from roughly the fifth to the twelfth centuries. They were farmsteads, the enclosed homesteads of farming families, their earthen banks and external ditches, known as fosses, marking a boundary between the domestic interior and the wider landscape. The Moanroe Beg example, compiled in survey records by Denis Power and uploaded in August 2011, preserves the eastern arc of the original enclosure: a semicircular area measuring approximately fourteen metres east to west and thirty metres north to south, edged by a bank that stands about half a metre on the outside face and slightly less on the interior. The external fosse survives too, though modestly, reaching only about a quarter of a metre in depth and just over a metre in width. A gap of nearly three metres in the eastern bank likely marks the original entrance.

The site sits in level pasture, which makes the modest earthworks readable if you know what to look for, though the northern end of the surviving arc is under rough grass and the southern end has been considerably obscured by overgrowth. Visitors should expect to do a little work to distinguish the bank from the surrounding ground, particularly toward the south. The deep watercourse that bisects the original enclosure is the most immediately obvious feature, and standing beside it, you can use its line to mentally reconstruct where the missing western half once lay. There is no dramatic ruin here, no stonework, no signage; just a quiet field, a surviving curve of earth, and the faint geometry of an early medieval life.