Recorded on the Ordnance Survey six-inch maps as Toberlissagunna, it sits in pastureland subject to flooding from a turlough, the distinctly Irish phenomenon of a seasonal lake that appears and disappears as the water table rises and falls through limestone karst. When inspectors visited the site, the well was entirely submerged beneath the turlough's waters, its drystone surround invisible below the surface. That surround, when accessible, forms a roughly circular enclosure measuring approximately 1.55 metres north to south and 1.2 metres east to west, with an opening facing west-northwest.

The well almost certainly takes its name not from any tradition associated with the water itself, but from a nearby cashel called Caherlissagunna, the remains of which lie around 85 metres to the northwest. A cashel is a stone-walled ringfort, a form of enclosed farmstead common across early medieval Ireland, and the shared place-name element suggests the well was understood locally as belonging to, or at least identified with, that older enclosure. It is a reminder that holy wells in Ireland rarely existed in isolation; they were part of wider local geographies, their names carrying traces of the settlements and structures that surrounded them.