To enter, a visitor must stoop and step down onto a silted floor, where iron girders now support the lintels overhead. This is Saint John's Well, a holy well where the architecture of devotion has accumulated in layers: a masonry wall tucked under bedrock, a nineteenth-century crucifixion plaque on the outer wall inscribed 'Erected to the Glory of God, in Honour of St. John', a statue of St. John the Baptist placed on top of the outcrop itself, and a small shrine immediately to the west holding a statue of the Child of Prague alongside other religious objects. Holy wells in Ireland were venerated long before Christianity and were often absorbed into the new faith, their sacred character transferred to a patron saint while the physical act of visiting remained continuous across centuries.

The well sits inside a subrectangular walled enclosure roughly 29 metres east to west and between 17 and 20 metres north to south, positioned just 125 metres northeast of Killone Augustinian nunnery, a medieval religious house on the same lakeshore. The proximity is unlikely to be coincidental; the nunnery and the well almost certainly formed part of the same devotional landscape. About seven metres south of the well chamber lies a rectangular depression, roughly 1.85 metres by 1.7 metres and nearly a metre deep, lined on all sides with drystone walling and accessible by steps from the west. A tree grows directly out of its wall. Known locally as the 'tank', this feature may have served as a washing or bathing area associated with the well. A stone altar lies a further five metres to the west, completing an ensemble of structures that suggests organised, communal religious practice rather than simply a solitary spring.

The well is still visited on the 23rd of June, the eve of the feast of St. John, a date that corresponds with Midsummer and with older patterns of seasonal observance that predate the Christian calendar. That a congregation still gathers here on that particular night, stooping through the low entrance and moving between the chamber, the tank, and the altar, gives the site a quality that no amount of masonry or plaque can fully explain.