At Ráth Ciaráin in County Kerry, there is said to be a holy well dedicated to St Brendan, the sixth-century monk venerated across Ireland and beyond as the great seafaring saint. The difficulty is that nobody has been able to find it. Local tradition places it a short distance east of St Fintan's Well, a neighbouring holy well that does exist and can be visited, but the Brendan well itself has proven elusive to anyone who has gone looking.

Holy wells in Ireland were typically natural springs or water sources that became associated with a particular saint, often serving as sites of local pilgrimage and patterns, the annual gatherings of prayer and ritual that shaped rural religious life for centuries. The pairing of two saints' wells in close proximity would not be unusual on the Iveragh Peninsula, where early Christian activity left its mark across the landscape in the form of church sites, hermitages, and sacred water sources. St Brendan and St Fintan are both figures from the early Irish church, and their names appearing together in local memory at this one spot suggests some depth of tradition, even if the physical evidence has faded or vanished entirely. The well may have been lost to landscape change, overgrowth, or simply the gradual erosion of the local knowledge that once kept its location alive.