The karst here is the same porous, fractured limestone that defines so much of this part of Ireland, a geology that makes the ground alternately bone dry and submerged depending on the season. In winter the surrounding fields fill with water, and the well itself becomes hard to distinguish from the broader flooding around it.

The well appears on the 1920 edition of the Ordnance Survey six-inch map under the name Toberaun, a name derived from the Irish tobar, meaning well. The structure itself consists of a circular basin roughly two metres across, with a narrower arm or extension projecting to the northwest, giving the whole thing an asymmetrical, almost improvised footprint. The water surface sits about ninety centimetres below ground level, though the well is quite shallow, no more than twenty to thirty centimetres of actual water depth. Around it runs a low drystone wall, poorly constructed by comparison with the more carefully maintained enclosures found at sites still in active devotional use. At the northeast, the wall has a gap where a young ash tree has since taken hold, and this break may once have served as a stepped entry down to the water. The ash is a species that turns up repeatedly at wells across Ireland, sometimes planted deliberately, sometimes simply opportunistic, its presence here sitting somewhere between the two.