An ash tree grows directly from the walls of this stone-lined well on a steep north-east-facing slope in County Waterford, its roots threaded through the masonry as though the structure and the tree have long since agreed to share the space. The well, known in Irish as Tobar Chuain, measures roughly three metres by two and a half, and descends to a depth of nearly two metres. It sits within a D-shaped enclosure defined by stone walls, a short distance north-east of an associated church site, and a stream runs north to south in the valley below.

Holy wells in Ireland were typically focal points for patterns, a word derived from the Irish "patrún" meaning patron, referring to annual gatherings held on or around a saint's feast day that combined religious observance with communal celebration. At Toberquan, such a pattern was recorded in the Ordnance Survey Name Books as taking place across three days each July, from the 9th to the 11th, during the nineteenth century. The dedication to Cuan embedded in the well's Irish name connects it to a local or regional saint, though the well's precise history was noted by Patrick Power in his 1896 survey of the ancient ruined churches of Waterford, published in the Waterford Archaeological Journal. The combination of the well, the enclosing walls, and the nearby church site suggests a layered sacred landscape that accumulated significance over a long period.