The enclosure is just ten metres in diameter, and what makes it quietly remarkable is the possibility that the bog grew up around it rather than the other way around. If it is indeed a pre-bog enclosure, the peat accumulated over centuries or millennia after the structure was built, gradually burying it while preserving its outline beneath.

The site was identified by Séamus Ó Murchú in 2016, on a relatively flat terrace close to the source of the River Clodiagh, which runs southward to join the River Nore. The elevated, waterlogged character of Brandon Hill is precisely the kind of terrain where blanket peat, a layer of wet, acidic organic material that builds up in cool, high-rainfall environments, can accumulate deeply enough to obscure structures that were once standing features of a managed landscape. Roughly 45 metres to the north sits a separate sub-rectangular structure, suggesting this part of the hillside may have supported more activity than its current appearance implies.