The cashel at Ballybreen, a type of stone-walled ringfort built from dry-laid masonry rather than an earthen bank, sits in a largely overgrown field on reclaimed pasture in County Clare, with open views stretching south and southwest. There are no definite entrances in its circuit. A gap in the southern wall might look like the original threshold, but it is most probably the work of tree roots pushing through over centuries rather than any deliberate opening left by the people who built the place.

The structure itself is subcircular in plan, measuring roughly 23.5 metres north to south and 24 metres east to west internally, with a collapsed and grassed-over wall that still stands between one and two metres in height and runs to about 4.5 metres wide. Along the southern and southwestern arc, the outer facing of large, regularly sized limestone blocks survives to just over a metre, giving a sense of how carefully the wall was once constructed. The inner facing has not survived, so the original full width of the wall cannot be determined. The cashel was already recorded on the Ordnance Survey six-inch map of 1840 and again on the 25-inch edition of 1897, which means it was a legible feature in the landscape long before modern archaeological survey took notice. Inside, two low rectangular mounds of stone and earth sit within the interior, one near the centre and a second, slightly longer one along the inner perimeter to the east-northeast. A souterrain, an underground stone-lined passage typically used in early medieval Ireland for storage or refuge, lies in the northwest quadrant, and a curving field boundary runs approximately 21 metres to the north, suggesting the cashel once sat within a broader organised landscape of enclosures and agricultural activity.