At Carrowkeel in County Sligo, a low earthen mound once sat in level pasture, unremarkable enough that it went unnoticed on the Ordnance Survey's six-inch map of 1837, and ambiguous enough that, even when it was finally documented, its origins remained uncertain.

When a fieldworker visited in 1981, they described a small, flat-topped mound of irregular shape, roughly seven metres across and just seventy centimetres high, grass-covered but with some stone visible at the surface. The assessment was cautious: this might have been no more than a clearance cairn, the kind of feature farmers create when gathering loose stones from a field to make it workable, rather than anything of deliberate prehistoric or historic construction. A clearance cairn carries no ceremony or intention beyond tidying the land, which makes it difficult to distinguish from something more purposeful once the original context is gone. The uncertainty was never resolved. At some point after 1981, the mound was levelled, and there are now no remains visible at ground level.

What the site leaves behind is a gap in the record rather than a presence in the landscape. Its formal documentation outlasted the physical feature itself, which gives it a quietly strange quality: a place that was surveyed, described, and filed away, only to disappear before anyone could say with confidence what it actually was.