At Annyart in County Monaghan, an earthwork once commanding the highest point of a drumlin ridge, one of those elongated whale-back hills formed by glacial deposits, has effectively vanished from the landscape, surviving now only in the cartographic memory of nineteenth-century mapmakers.

The 1834 edition of the Ordnance Survey six-inch map shows a circular embanked enclosure roughly thirty metres in external diameter, labelled in the deliberate gothic lettering the surveyors reserved for antiquities and rendered simply as a "fort". Such enclosures are broadly understood as ringforts, a class of monument built in Ireland largely during the early medieval period, typically serving as enclosed farmsteads for a single family or small community. The elevated position at the western end of an east-west ridge would have been a sensible choice, offering visibility across the surrounding terrain. By the time the revised OS edition appeared in 1907, the feature had already diminished to little more than a curve in a field bank, suggesting that by then agricultural reshaping had largely done its work. Today the site sits within a grass and scrub-covered field, and nothing is visible at ground level.

What remains, in a sense, is the document of the loss itself: two maps separated by seventy-odd years that together trace the arc from recognisable monument to residual boundary feature to absence. The ridge is still there, the highest point still commands its modest view, but the enclosure that once justified the gothic lettering has been absorbed entirely into the ordinary geometry of the fields around it.