That is a striking claim for a spring that sits some distance inland, and it sets the site apart from the more familiar associations of healing skin complaints or restoring sight. The well itself is a carefully constructed thing, a circular stone-lined structure roughly a metre across, covered with a flat rectangular slab. More striking still is what serves as a step down to the water: an old millstone, about 80 centimetres in diameter, built into the southern side of the well opening and projecting slightly northward from the retaining wall. The repurposing of a heavy piece of milling equipment as a threshold stone gives the place a quietly layered quality, utilitarian and sacred folded together.

The well is dedicated to St Fiachra, who according to tradition founded a church at Ullard in the latter part of the sixth century. The medieval church still stands in the same field, roughly 70 metres to the south-south-east of the well, and nearby are two bullaun stones, those basin-like depressions hollowed into boulders that are found at many early ecclesiastical sites across Ireland, their original function still debated. The well sits at the south-western end of a long, rectangular stone-lined channel aligned north-east to south-west, measuring just over eleven metres in length. As late as 1948, the feast day of the saint on the 8th of February drew pilgrims to perform what are known as penitential rounds, the traditional walking of a prescribed circuit in prayer. That year, sixty people came. They moved in silence through the site, as one participant put it, "speaking to no one, only to God and poor St. Feeragh", finishing their devotions at the church by placing small crosses of twisted twig in the east window.