In a grassland field at Drumharsna in County Galway, there is recorded the former location of a cashel, a type of stone ringfort defined by a roughly circular drystone wall, which would once have enclosed a farmstead or small settlement during the early medieval period. Nothing of it can be seen today. The field gives no indication that anything of significance ever stood there.

What is known comes from a 1952 classification by a researcher named McCaffrey, who recorded the site as a circular stone fort approximately 33.8 metres in diameter. That diameter is a meaningful figure: a cashel of that scale would have been a substantial enclosure, its drystone wall rising to chest height or above, marking out a defended domestic space in a landscape that was already being farmed and organised centuries before the Normans arrived. By the time McCaffrey was recording it, the structure had already lost whatever visible presence it once had, and since then no surface trace has survived at all. Whether the stone was robbed out for later building, or simply buried under accumulating soil and agricultural disturbance, is not recorded.