Yet St. Munchin's Well at Coolcashin in County Kilkenny survives as a remarkably complete piece of stonework, its oval chamber carefully lined and its access passage still intact, even if the water that once gave it purpose is long gone. Built into a south-facing slope just below the crest of a hill, the well sits in rolling grassland about eighteen metres west of the boundary wall of an adjoining graveyard, close enough to the medieval church it served that the relationship between the two was never in much doubt.

The structure itself is modest but precise. The stone-lined chamber measures roughly 0.86 metres northeast to southwest and 1.14 metres northwest to southeast, with a depth of just under a metre. A short access passage, lined in stone and only 0.33 metres high, leads down into it from the southeast, though this entrance is now largely blocked by a large flat lintel. Holy wells in Ireland were typically dedicated to local saints and associated with patterns, the traditional gatherings held on a saint's feast day that combined prayer with communal ceremony. The connection to St. Munchin places this well within that devotional tradition, though by the time Ordnance Survey officers were compiling their local letters in 1839, whoever they spoke to could only report that the well belonging to the church had lain twenty yards to its west, and that it was by then already closed up. The well had effectively passed out of active use before the Victorian era, which makes its physical survival all the more notable.

The site sits approximately fifty metres northeast of a stream that feeds into a larger river about four hundred metres to the east, a detail that is a reminder of how frequently early ecclesiastical sites were positioned in close relation to water sources, whether for practical reasons, ritual ones, or both.