At Teernakill in County Galway, what survives of the site known as Tobar Feichín is a small circular depression in the ground, roughly twenty centimetres across, dry at the time it was recorded, and sitting about three metres east of a natural spring that continues to flow nearby. The relationship between the two features is part of what makes the place quietly puzzling: the named, venerated well is the lesser one, the diminished one, while the living spring beside it carries no particular sacred designation.

The well is dedicated to Saint Feichín, a seventh-century Irish monk associated primarily with Fore in County Westmeath, though his cult extended into Connacht, where several place names and dedications bear his name. Holy wells in Ireland were typically sites of pattern days, localised gatherings combining prayer, ritual circuits, and social occasion, often held on the feast day of the well's patron saint. The site at Teernakill sits close to an old road at the foot of a south-facing scarp, the kind of sheltered, liminal location that frequently attracted such dedications. James Hardiman noted the site in 1846, which places its recorded history well into the nineteenth century, though the well itself is almost certainly older than any surviving written reference to it.