Whether that hollow is the work of human hands or simply the result of natural weathering in the limestone is genuinely uncertain. That ambiguity is perhaps fitting for a site where almost everything is a matter of degree: how much wall survives, how much was once there, how much can still be read in the landscape at all.

A cashel is a stone-walled ringfort, the dry-stone equivalent of the more familiar earthen rath, and this one occupies a peculiar natural platform in Deerpark. The berm of outcropping rock on which it sits drops away steeply into a ravine on most sides, roughly twenty metres wide and five metres deep, with only a stretch of level ground to the west offering easier approach. The cashel itself is subcircular, measuring around twenty-three metres east to west and nineteen metres north to south. When the antiquary Thomas Johnson Westropp visited in 1913, he described it as well-built. A century later, it is far less legible: the northern section has vanished entirely, and what remains is largely a spread of collapsed stone, with outer wall-facing of horizontally laid stones still visible from the east around to the west, rising in places to nearly two metres in height. The entrance gap at the east-north-east, just under one and a half metres wide, is where that puzzling stone was found standing on edge, its smoothed face and shallow depression raising the possibility that it was once a bullaun stone, a type of worked stone with a rounded hollow traditionally associated with ritual or practical use, though nothing about this example is conclusive. The site appears on both the 1897 Ordnance Survey twenty-five-inch plan and the 1920 edition of the six-inch map, and a wedge tomb lies approximately one hundred and twenty metres to the north-east, suggesting this corner of Clare was in use across a considerable span of prehistory.

The site is heavily overgrown with hazel wood and briars, which makes the stonework difficult to trace even when you are standing directly on it. The ravine that surrounds much of the cashel gives the place an oddly fortified quality that the collapsed walls themselves no longer convey.