A roughly circular ditch, about ten metres across, is invisible at ground level but betrays itself in a summer aerial photograph as a cropmark, a phenomenon where buried features cause crops above them to ripen unevenly, creating patterns of colour and texture that stand out from above. It is a quiet, unremarkable piece of farmland that turns out, when viewed from altitude, to be annotated with prehistory.

The ring-ditch was identified in an aerial photograph taken in July 1989 as part of a systematic survey. What showed up was the cropmark of a fosse, the term for a ditch typically cut around a monument, tracing a near-perfect circle with a diameter of roughly ten metres. Immediately to the south, a distinct patch of unripened crop appeared, of similar dimensions, suggesting the presence of a second, related feature just beyond the main enclosure. Ring-ditches of this kind are generally understood to be the remnants of Bronze Age funerary monuments, the ditches that once surrounded a burial mound which has long since been ploughed flat. Two further ring-ditches lie to the west and west-northwest of this one, which suggests that what survives at Dromin is not an isolated burial but part of a wider funerary landscape, a cluster of monuments that once marked this ground as significant to the communities who lived here thousands of years ago.