Yet the well at Aghatubrid in County Kerry retains a quiet archaeological presence, largely because of what was left behind when it was filled in during the 1940s: a large stone slab, over two metres long and half a metre across at its widest point, carved with an equal-armed linear cross near one end. That slab, which local tradition holds once stood close to the well itself, now lies prone on a field boundary roughly twenty metres to the north of where the water once surfaced.

The well sat approximately 270 metres east of the Kilpeacan ecclesiastical site, a early Christian religious enclosure that anchors this part of the Iveragh Peninsula in the early medieval period. Holy wells in Ireland were typically associated with a local saint and served as focal points for patterns, the devotional gatherings that combined prayer, ritual circumambulation, and communal assembly, often on a saint's feast day. The cross-inscribed slab connects Aghatubrid to that same tradition; such slabs were commonly erected near wells and church sites as markers of sacred ground. The equal-armed cross carved into this one is a form found widely across early Christian Ireland, incised rather than raised, suggesting it was worked directly into a naturally flat stone. Whether the slab predates, postdates, or is strictly contemporary with the well's active use as a place of devotion is impossible to say with certainty, but the two were clearly understood as belonging together within living memory.