At Carrownacreevy in County Sligo, a barrow, which is a burial mound typically raised over prehistoric remains, once appeared on Ordnance Survey maps as a small circular enclosure set into undulating pasture. Today, nothing of it can be seen at ground level. The mound has been levelled, and the field rolls on as though nothing was ever there.

What makes the site traceable at all is the documentary record left by nineteenth and early twentieth-century cartographers. Both editions of the Ordnance Survey six-inch map show the enclosure clearly, marking it as a distinct feature in the landscape. By the time of the 1913 edition, a field boundary running northeast to southwest had already come to abut the eastern side of the site, suggesting that agricultural reorganisation was pressing in around it even then. At some point after that, the mound itself was lost entirely, absorbed into the working farmland that surrounds it.