It is modest to the point of near-invisibility, and yet it sits just twenty metres north of one of the island's round towers, placing it within a tight cluster of early Christian monuments that speak to centuries of continuous veneration. This is Tobar Éinne, the well of Saint Enda, whose Latin name, recorded in nineteenth-century Ordnance Survey correspondence as Dabhach Éinné or Dolium Endei, translates roughly as the vessel or vat of Enda.

Saint Enda, founder of the monastery at Cill Éinne, is regarded as one of the earliest and most significant figures in Irish monasticism, and the well bearing his name has long been a focus of local devotion. A leacht, a low rectangular altar of drystone construction measuring roughly 1.6 metres in length and 0.9 metres in height, stands just one metre to the north of the well, topped with a modern cross slab. Leachta of this kind are a characteristic feature of early Irish sacred sites, typically serving as stations for prayer during patterns, the traditional rounds of devotional walking associated with a saint's feast day. That the well and the leacht sit in such close proximity to both the round tower and a second holy well approximately forty metres to the north-east suggests this was once a well-organised and actively used sacred precinct rather than an isolated curiosity. The site was noted by the antiquarian T. J. Westropp as early as 1895, and the local name Tobar Éinne has persisted in use alongside the older Latinised form recorded in the Ordnance Survey letters compiled by John O'Flanagan in the 1830s.