What makes this particular well in Carrowntedaun, roughly three kilometres south of Lahinch, stranger still is the material used to build it: the enclosing wall and a nearby canopy shelter are both constructed from sea-rolled stones set in mortar, the kind of smooth, wave-worn rock you would gather from the beach immediately to the north. The effect is of something drawn directly from the shoreline and reassembled at height, dedicated to St Senan, a sixth-century monastic figure associated with Scattery Island in the Shannon estuary. A cross erected in 2003 carries his name and the date, suggesting the site has been actively tended in living memory.

A record from 1937, gathered as part of the Irish Folklore Commission's Schools Collection, in which primary school pupils were asked to document local knowledge and traditions, notes that the well was reputed to cure sore eyes and pains in the legs. These are among the most commonly recorded curative claims attached to holy wells across Ireland, where the practice of visiting a well, performing prescribed circuits or prayers known as "rounds", and sometimes leaving votive offerings, stretches back well before Christianity and was absorbed into popular devotion over centuries. The 1937 account mentions that rounds had been performed at this well around twenty years earlier, placing the last recorded practice somewhere in the 1910s, though the 2003 inscription and the candles and statues housed in the canopy beside the well suggest the site has not been entirely forgotten since.