This is Toberkieran, a holy well so quietly worn away by time that its sacred character survives mainly in its name. Holy wells in Ireland were traditionally focal points for local devotion, often associated with a named saint and visited on a pattern day for prayer, rounds, and the tying of offerings to nearby branches or stones. Here, those practices have long since ceased, and what remains is a pool barely twenty centimetres deep and roughly a metre across, set among rock and moss on a moderately steep hillside.

The well takes its name from Saint Ciarán, one of the most venerated early Irish saints, associated most famously with the monastery at Clonmacnoise in County Offaly. How his name came to be attached to this particular spring in Keelhilla is not recorded, but the dedication is old enough to have been considered worth marking on the Ordnance Survey six-inch maps of both 1842 and 1915, where it appears named as Toberkieran. That kind of cartographic continuity over seventy-odd years suggests the well was still recognised, if not actively venerated, into the early twentieth century. A few tumbled moss-covered stones to the west of the pool may be the last traces of an enclosing wall, the sort of modest protective structure that would once have given a well a degree of formality and set it apart from the surrounding landscape.