The earthwork at Ballynamona in County Limerick does something slightly different. It sits right at the edge of a stream bank, a tributary of the Camoge River, with no fosse, which is the encircling ditch typically dug to reinforce a ringfort's outer wall, and no bank running around or across its platform. What remains is a circular, fairly flat-topped earthen mound, rising just over two metres at its highest point, with an overall diameter of about thirty metres. It is modest by the standards of the form, and quietly anomalous in its construction.

A ringfort, sometimes called a rath when built from earth rather than stone, was the most common type of enclosed settlement in early medieval Ireland, typically dating from roughly the fifth to the twelfth centuries. They served as farmsteads, their banks and ditches marking off a household's living space from the surrounding land. The Ballynamona example was recorded in detail by O'Kelly in 1942 to 1943, who noted its unusual lack of a fosse and the absence of any enclosing bank on the mound's surface. The description was published in 1943 and remains the primary written record of the site. Its position immediately beside a watercourse is worth noting; proximity to a stream would have had obvious practical value for any settlement, even if the site's low profile and missing defensive features make it harder to read than most.

The outline of the monument is clearly visible on aerial photography, including images taken by the Archaeological Survey of Ireland in January 2003, and it can be identified on Digital Globe aerial photographs as well. For anyone visiting the broader Camoge River valley in County Limerick, the site sits close to a small tributary stream, and the flat-topped mound is the main thing to look for at ground level. Given how subtle the earthwork is, aerial views are genuinely useful for understanding its shape before arriving on foot. There are no formal facilities or marked access points noted for the site, so checking land access locally before visiting would be sensible.