St. Brendan's Well in Brookville sits on the west bank of a stream, roughly sixty metres from Tonlegee church and its associated graveyard, and is marked today by little more than a lone bush. There are no votive rags, no offerings, no signs of the devotional activity that typically clings to such places across the Irish landscape. What survives is a thin trickle of water seeping from a hole in a cement wall, and a story about a spring that refused to stay buried.

When folklorist Caoimhín Ó Danachair visited in 1958, he found a small well of about 1.2 metres in diameter, sheltered by a clump of whitethorn and a large poplar tree, with the water already piped away for domestic use. He noted no evidence of devotion. The more dramatic chapter, however, had played out several decades earlier. Around 1914, an outbreak of fever in the area led locals to suspect the well was a source of contamination, and it was filled in. The water promptly surfaced in the kitchen of a nearby house, and the well had to be reopened and the supply redirected by pipe. A 1985 account by Appleyard records that by 1934 a low stone arch had been built over the well to protect it, though that structure has since been removed. The name of the well, the placename Brendan's Parkes, and the original dedication of Tonlegee church are, according to the 1985 account, the only surviving connections to St. Brendan himself.

The site lies on the west bank of the stream that runs past Tonlegee church in the Brookville area of County Dublin. Because there are no formal markers or signs of active veneration, it is easy to walk past without registering anything of significance. The lone bush noted in the records is the main visual cue. Visitors curious about the broader setting may find the adjacent church and graveyard, both recorded in the Sites and Monuments Record, offer more immediately legible historical context. The well itself rewards a certain kind of attention, less to what is visibly there than to what the landscape has quietly absorbed and, on at least one occasion, refused to keep down.