It leaves no visible trace in the grass, no earthwork, no raised bank. The only way to see it is from above, and even then only under the right conditions: a dry summer, when parched soil reveals the ghost of a buried ditch as a slightly different shade in the crop.

What the aerial image shows is a subcircular enclosure, roughly 48 metres east to west and 34 metres north to south, defined by a continuous fosse, which is essentially a ditch dug to demarcate or defend a space. The enclosure sits on a gentle east and north-facing slope at the eastern end of a low ridge running east to west. This kind of cropmark, where a buried feature affects the growth or colour of vegetation above it, can betray sites that have been invisible at ground level for centuries, sometimes millennia. The site was first identified by Jean Charles Caillére, who spotted it on a Google Earth image captured in July 2021. Before that observation, it had gone unrecorded.