Others survive only as marks on old maps, and a few do not even manage that. At Loughanelteen in County Sligo, there is an enclosure that exists now in neither form; it has been entirely levelled, leaving no visible trace at ground level. What we know of it amounts to a single cartographic appearance: it was recorded on the 1912 edition of the Ordnance Survey six-inch map as a roughly circular area of approximately twenty metres in diameter, indicated by hachures, the small radiating lines surveyors used to suggest an earthwork or raised feature. It did not appear on the earlier 1837 edition of the same map series, which either means it was missed by the first surveyors or that something in the intervening decades brought it to notice.

The site sits on the level summit of a north-south orientated ridge, now covered in coniferous forestry. Circular enclosures of this kind are a familiar but not fully understood feature of the Irish landscape; they may represent ringforts, which were enclosed farmsteads typically built between the sixth and tenth centuries, or earlier prehistoric settlements, or something else entirely. Without excavation, and without any surface remains to examine, this particular example cannot be assigned to any period with confidence. The forestry that now covers the ridge has in all likelihood contributed to the obliteration of whatever earthwork once defined the enclosure, whether through planting, drainage works, or the general disturbance that commercial forestry brings to a site.