Marked consistently as St. Agatha's Well on the Ordnance Survey six-inch maps of 1839 and 1925, the site was nonetheless recorded by the scholar John O'Donovan around 1840 as St. Agnes' Well, a discrepancy that was never resolved and has simply been carried forward ever since. The well itself sits on flat, low-lying ground at the source of a small stream that runs west to east, a modest and easily overlooked arrangement of a stone-lined well roughly 0.7 metres across, sheltered by an overhanging bush, with a large flat slab measuring around 1.18 by 0.84 metres lying just to its south.

Holy wells, common across Ireland, were places where water emerging from the ground was believed to carry curative or spiritual power, often associated with a local saint whose name the well bore. This one was known locally to cure warts, and offerings were left at the site until around 1960, when the practice quietly ceased. The area around it was prone to flooding, and the well is now disused, its ritual life apparently fading away with the last generation that maintained it. An early church site lies roughly 200 metres to the north-east, which suggests the well was once part of a wider sacred landscape rather than an isolated curiosity. Whether the patron was Agatha or Agnes, both saints share a feast day tradition in early February, and either name would fit the pattern of wells dedicated to figures associated with healing.