Holy well, Slade, Co. Dublin

That practical, dairy-centred reputation sets Tobar Seanáin, or St. Senan's Well, slightly apart from the more devotional holy wells that pepper the Irish countryside. Holy wells are typically natural springs that acquired sacred or curative associations through early Christian dedication, often layered on top of much older folk belief, and this one carries both qualities quietly together.

The well sits in the parish of Saggart, roughly a mile from the village, and is dedicated to St. Senan, as recorded by the folklorist Caoimhín Ó Danachair in 1958. It appears simply as 'Well' on the 1863 edition of the Ordnance Survey Ireland 25-inch map, which suggests it was well known enough to mark but unremarkable enough not to name officially. Much of what we know about the site comes from accounts gathered by local schoolchildren in Saggart as part of the Irish Folklore Commission's Schools' Collection, a nationwide project that recorded local knowledge through the notebooks of primary school pupils during the late 1930s. Several of those accounts describe the water being used for churning, with a consistent belief that butter made from it tasted noticeably better. One account also credits the well with curing toothache. A third account locates it more precisely in what was then known as Byrne's field, with a stone cover placed over the spring itself.

The well is on the western side of the Slade river valley, accessible from the village of Saggart, which lies to the south-west of Dublin city. As it sits in private farmland, visiting requires care and local awareness; the stone covering noted in the folklore accounts is worth looking for as a marker of the site. There are at least two other named holy wells associated with the same parish, St. Patrick's Well and Tobar Moling, which suggests the Saggart area retains an unusually dense concentration of such sites for a parish so close to the capital.