Yet this well in the townland of Ceathrú An Lisín, County Galway, has held enough local significance to carry two names: the official designation Tobercanonagh and the name by which people in the area have long known it, Tobar Cheannanach.

The well sits roughly thirty metres north-north-west of the early ecclesiastical site of Cill Cheannanach, a proximity that almost certainly explains its importance. Holy wells in Ireland were frequently associated with nearby church sites or patron saints, and the shared root of both names here, pointing to the same personal or place name, suggests a long-standing connection between the two. The boulder from which the spring issues is described as earthfast, meaning it is a natural rock fixed in the ground rather than a placed or worked stone, and the simple drystone wall enclosing the source is the kind of low, careful stonework that marks a site as tended rather than incidental. The detail was recorded by O'Flanagan in 1927, which places at least that description of it in the early twentieth century, though the well itself and its association with the adjacent ecclesiastical site are presumably considerably older.