Recorded in the Ordnance Survey Letters of 1837 under the Irish name Tobar Teine Aoil, meaning the Limekiln Well, the name itself points to the industrial character of the landscape it once occupied. Limekilns were common features of the Irish countryside, stone-built furnaces used to burn limestone and produce quicklime for agricultural use and building mortar, and their presence often gave names to the townlands and fields around them. That this well was named after one suggests it sat close to such a structure, embedded in the working life of the farm rather than set apart as a place of devotion.

What makes the record particularly striking is the claim attached to it. According to O'Flanagan's 1927 account of the Ordnance Survey material, it was believed that the well at St. Patrick's Cathedral in Dublin was fed by the same stream that supplied Tobar Teine Aoil. St. Patrick's Cathedral, founded in the twelfth century, has its own long association with water; the area around it was notably marshy, and the presence of a holy well near the cathedral site was recorded from an early period. Whether the hydrological claim had any basis in fact is unclear, but the tradition itself is telling, drawing a line of connection between an obscure rural well and the water source of one of Ireland's most significant medieval foundations.

The difficulty with this site is that it cannot be precisely located. The 1837 Ordnance Survey Letters are invaluable records of local tradition and topography, but they do not always pin features to a fixed point, and Tobar Teine Aoil appears to have slipped out of active memory since. Anyone researching it would do well to consult the original OS Letters alongside the first-edition six-inch Ordnance Survey maps for the relevant Dublin townlands, scanning for field names or marginal annotations that might narrow the search. The well, if it survives at all, is likely on private agricultural land, and any visit would require permission from the landowner. It is the kind of place that exists more fully in the documentary record than on the ground, and that gap between the written name and the physical site is part of what makes it worth knowing about.