County Galway Connemara
There is a beautiful astonishing small well-preserved church on the island dedicated to St Caillen (qv also under Fenagh in Leitrim. There is a holy well on the mainland.
OS: 44 531 410 marked
OS: 44 558 427 well
see: Anthony Previte A Guide to Connemara’s Early Christian Sites Oldchapel press 2008