It is, in fact, a cashel, a type of ringfort built from dry-stone walling rather than earthen banks, and common across the west of Ireland. What makes this one quietly interesting is how thoroughly time and reuse have absorbed it back into the land. The wall, once a substantial structure between 3.8 and 5.5 metres wide, has collapsed and grassed over to such a degree that it now rises barely 15 centimetres above the interior ground level, and only 35 centimetres on its outer face. A 4-metre stretch of original outer walling is still legible at the northern side, offering the clearest glimpse of what was once a proper enclosing boundary.

The cashel measures approximately 21 metres east to west and 20.5 metres north to south, making it a modest but coherent example of its type. It sits within a large multiperiod field system, meaning the surrounding landscape has been shaped and reshaped by human activity across several distinct eras, the cashel itself being just one layer in a longer sequence of occupation and land use. It was recorded on Ordnance Survey six-inch maps as far back as 1842, and again on the 1920 edition, both times marked with hachuring to indicate an enclosure of some kind. Oddly, when it was formally listed in the Record of Monuments and Places in 1996, it was catalogued simply as an 'Enclosure', a cautious designation that understates what is clearly a cashel. A later sheepfold has been built against its western side, a reminder that the structure continued to serve practical purposes long after its original use was forgotten. Another cashel of similar character lies roughly 55 metres to the east, suggesting this part of Teergonean was once a more densely settled or managed area than the empty pasture around it now implies.