It is a smooth natural pothole, roughly twenty centimetres across, worn into a rock outcrop and covered with a round flat stone as a lid. Known locally as Tobar Mhuire, meaning Mary's Well, it belongs to a long tradition of sacred water sources venerated at particular rocks, springs, and hollows across Ireland, where the physical modesty of the site has never diminished its local significance.

What gives the spot an added layer of interest are the saint's footprints said to be visible in the rock beside the well, and reportedly also at the front of the house nearby. Imprinted footprints in stone are a recurring feature of Irish sacred sites, usually understood as marks left by a holy figure at the moment of some significant act, a blessing, a departure, or a miraculous intervention. Whether these impressions are natural formations absorbed into devotional practice or something more deliberately shaped is a question the site itself does not easily answer. The detail was recorded by Tim Robinson, the writer and cartographer whose meticulous mapping of Connemara and the Aran Islands documented countless such local features that might otherwise have gone unrecorded.