In the townland of Mocorha in County Mayo, a holy well named Tobersharve appears on Ordnance Survey maps from both 1838 and 1929, sitting in what is described as wettish pasture. When fieldworkers later went to locate it, they came back empty-handed. The well is there on paper, twice over, across nearly a century of cartography, and yet on the ground it left no trace.

Holy wells, known in Irish as tobar, are a widespread feature of the Irish landscape, often associated with local saints, patterns (communal gatherings held on a saint's feast day), and folk cures. The name Tobersharve likely derives from the Irish tobar, meaning well, combined with a qualifying element, though its precise meaning is not recorded here. What is clear is that two separate generations of OS surveyors agreed the well existed and agreed on its name, which makes its subsequent disappearance quietly puzzling. It may have been absorbed into agricultural drainage, obscured by changed land use, or simply swallowed by the boggy ground that surrounded it. Wettish pasture in the west of Ireland has a way of closing over things.