A low rise in reclaimed bogland near Corimla, in County Mayo, is one such place. It sits roughly 300 metres north of where the Black River meets the Srafaungal River, with the larger Brusna River less than 600 metres to the west, and there is now nothing to see there at all. A house occupies the spot. What makes this unremarkable patch of pasture quietly interesting is precisely the sequence of decisions that rendered it invisible.

The site does not appear on the Ordnance Survey six-inch maps of 1837 to 1838, suggesting that, even then, whatever structure had stood there was not considered significant enough to record. By the time the more detailed 25-inch OS maps were produced, and again on the 1922 six-inch revision, a small earthwork was marked, shown in the cartographic convention of hachuring, which uses short lines radiating from a central point to indicate a raised or mounded feature. The overall diameter was approximately 20 metres, with a central area enclosed by a double ring. When Office of Public Works field investigators visited in 1958, they described what they found on the ground as an old house or byre, partly built from stone and partly from turf, with a collapsed bank encircling it. Their conclusion was that it held no archaeological interest, and the landowner was given permission to reclaim the land. By 1995, when the location was inspected again, the field was featureless pasture. The structure, the earthwork, the bank, all of it gone.

What the 1958 description captures, almost incidentally, is a type of vernacular building that was once widespread across the west of Ireland: a small enclosure of mixed stone and turf construction, used for sheltering animals or perhaps for seasonal habitation. Such structures rarely made it into formal records, and this one survived only long enough to be noted, dismissed, and then erased. The site now exists entirely in maps and field notes rather than in any physical form, which gives it a particular kind of melancholy interest for anyone curious about what bogland Mayo once held before reclamation changed the landscape so thoroughly.