This is Toberbrendan, a holy well dedicated to St Brendan, and its modest dimensions, roughly two metres east to west and a metre and a half north to south, give little indication of the devotional weight such sites have carried in the Irish landscape for centuries. Holy wells were, and in many cases remain, focal points for pattern days and local veneration, their sacred status predating formal Christianity and absorbed into it rather than displaced by it.

The well lies approximately 300 metres south-east of an Augustinian abbey at Eanach Dhúin, the Irish name for Annaghdown, a place with a long ecclesiastical history on the western shore of Lough Corrib in County Galway. The Augustinians were a mendicant order who established communities across medieval Ireland, and their presence here places the well within a broader complex of religious use in the area. The spring itself is natural, its oval form shaped by the land rather than by builders, though someone at some point took the trouble to define and protect it with a field wall of roughly laid limestone. References to the site appear in a number of early twentieth-century sources, suggesting it was known to antiquarians and local historians across several generations, even if it never attracted wider attention.