Marked collectively as St Augustine's Wells on the Ordnance Survey's first edition six-inch map and on the OS Fair Plan, they sit close to the high water mark, which is significant: one of the surviving wells is tidal, meaning saltwater reaches it. Two stood side by side to the north-east; a third lay roughly ninety metres to the south-west. The grouping gives an impression of a unified sacred site, but the cartographic and documentary record quietly resists that reading.

The south-western well appears to be the original St Augustine's Well. It is the only one shown on a map of the area drawn by Thomas Sherrard in 1785 as part of the Erasmus Smith papers, and a mid-seventeenth-century pictorial map of Galway references just one well under the Latin notation S. Augustini fons in australi latere montis, meaning St Augustine's well on the southern side of the hill. The two north-eastern wells, by contrast, were recorded by Fr McErlean in 1905 and 1906 as being dedicated not to St Augustine but to the Blessed Virgin Mary and St John the Baptist, though which was which remains unclear. Logan's map of Galway from 1818, reproduced in Hardiman's history of the city published in 1820, shows all three side by side and names them collectively as St Augustine's Wells, which is how the confusion seems to have been formalised. By the time the Ordnance Survey revised its 1:2500 plan in 1944, the north-eastern wells were already marked as 'Site of', and no visible trace of them survives today. The historian James Hardiman also noted an account of an 'Extraordinary Cure' said to have taken place at the south-western well in 1673, though he recorded it without full explanation.

The surviving south-western well was restored by the Galway Civic Trust in 2000 and now takes the form of a concrete hexagonal trough enclosed by a low dry-stone wall. Being tidal, its character changes with the water level, and it sits close enough to the lough shore that the boundary between holy well and coastal inlet is not always obvious.