The wall is pear-shaped, with an opening to the south-west, and on its inner northern face a shallow alcove holds white pebbles and more recent offerings left by visitors. A holy well of this kind, known in Irish as a tobar, is typically associated with a local saint and visited on a specific feast day, the water credited with curative or protective powers. This one is dedicated to Saint Feichín, and the ritual observance it attracted was tied to a fixed date in the depths of winter.

The antiquarian Roderic O'Flaherty recorded the well in 1684, noting that it was visited on the 20th of January and that it had 'of late proves very miraculous for restoring of health.' That phrasing suggests the well's reputation was still growing at the time he wrote, rather than already ancient and settled. By the end of the nineteenth century, R.A.S. Macalister documented an altar of sorts on the outer face of the wall, a projection in the masonry covered with large spherical pebbles. That feature has since disappeared entirely, leaving only the smooth enclosure and its alcove. The loss of the altar is a reminder of how fluidly the physical fabric of these sites shifts over time, even when the devotional habit persists.

Omey Island itself is a tidal island off the coast of Connemara, accessible on foot across the strand at low tide. The well sits on the seashore, meaning its surroundings are shaped as much by the Atlantic as by anything human. The white pebbles in the alcove, some traditional and some placed recently, suggest the site continues to draw people who know what they are looking for.