The roughly subcircular enclosure recorded at Ogúil in County Galway is a case in point: plotted on the 1898 to 1899 resurvey of the OS six-inch map, it could easily be read as the remains of something far older, a ringfort perhaps, or a cashel. Ground inspection settled the matter more plainly. It is a sheepfold, modest and functional, its walls built from a single line of unmortared drystone construction rising to about one and a half metres.

The fold measures roughly thirteen metres north to south and just under eleven metres east to west, giving it that slightly flattened circular outline that catches the eye on a map. Drystone walling of this kind, in which stones are carefully selected and laid without mortar so that the structure holds through gravity and friction alone, was the standard building method across the west of Ireland for field boundaries, enclosures, and farm structures well into the twentieth century. The resurvey that captured this particular fold was part of a broader Ordnance Survey revision programme carried out across Ireland in the closing years of the nineteenth century, updating earlier maps to reflect changes in land use and settlement. That a sheepfold should appear on such a map at all speaks to how thoroughly agricultural infrastructure was recorded, even when the structures themselves were unremarkable by local standards.