It is easy to mistake for a natural feature of the landscape, a gentle swelling in the earth, and that ambiguity is part of what makes it worth a second look. This is a rath, a type of ringfort typically consisting of a circular or oval enclosure defined by an earthen bank and sometimes a surrounding ditch. Raths were among the most common settlement forms in early medieval Ireland, functioning as farmsteads for a single family or extended household, often enclosing a house, outbuildings, and livestock. This one, measuring roughly 26 metres north to south and 18 metres east to west, survives as a raised area enclosed by an earthen scarp reaching about 0.6 metres in external height.

What makes the Glen rath quietly compelling is how legibly it shows the wear of centuries of agricultural activity. There is no fosse, the encircling ditch that typically accompanies such monuments, visible at ground level. At some point, field drains were cut into the external base of the scarped edge on all sides, a practical intervention by farmers managing waterlogged ground that has since left its own mark on the monument. Those drains are now relic and largely silted up, but the spoil excavated from them was dumped back onto the very edge of the rath, partially burying and distorting it. Along the western and northern arc of the site, the edge has been straightened off in the process, the original curving line of the enclosure surviving only between the north-east and south-east. The original entrance, which would typically be identifiable as a gap in the bank or scarp, is no longer recognisable. The interior itself undulates irregularly, a surface that hints at whatever structures or activities once occupied this small, defined space without giving much away.