The well at Corracreigh, in County Roscommon, carries the name of Ireland's patron saint, but appears to have attracted none of that. As far as anyone can establish, it was never a site of pilgrimage or devotion, which makes its persistent appearance on Ordnance Survey maps across nearly a century something of a quiet puzzle.

The well is recorded on the six-inch Ordnance Survey maps of 1837, 1914, and 1927, each time identified in the formal gothic lettering that cartographers reserved for antiquities and features of some presumed significance. It sits towards the bottom of a south-facing slope in Corracreigh, yet it is not visible at ground level. How the mapmakers knew it was there, or why they continued to mark it across successive editions, is not recorded. Roughly 140 metres to the north-west lies a mound, a raised earthwork of the kind found throughout the Irish midlands and west, the origins of which can range from prehistoric burial cairns to later field monuments. Whether the proximity of the two features is coincidental or reflects some older, now-forgotten relationship between them is impossible to say.