An oval enclosure, roughly 95 metres by 60 metres, was recorded on the third edition of the Ordnance Survey six-inch map in 1933, sitting on a low hummock in what was then, or had become, improved agricultural land. Today, no visible surface trace survives. The enclosure is, in practical terms, gone, or at least invisible, absorbed into the fieldscape around it.

Enclosures of this kind, broadly circular or oval boundaries defined by earthen banks, ditches, or a combination of both, are among the most common archaeological features in the Irish landscape. They served various functions across different periods, from early medieval ringforts used as defended farmsteads to prehistoric ceremonial sites, and their size and shape can offer clues, though rarely certainties, about their original purpose. At roughly 95 metres on its longer axis, this one sits at the larger end of the scale, which might suggest something other than a simple domestic enclosure, though without excavation or surviving earthworks, that remains speculation. What is notable is its position on a slight rise in reclaimed ground, a hummock, which is precisely the kind of modest topographical feature that early communities often favoured for settlement or enclosure. It also lies only 100 metres from a second recorded enclosure nearby, which raises the possibility that this part of Gortnalone was once a more densely structured landscape than it appears today.

The 1933 map record is itself a kind of archaeology, a moment when someone surveying the terrain could still see or detect what is no longer apparent. Reclamation and drainage of boggy or marginal ground, particularly intensive in the twentieth century across Connacht, has erased enormous numbers of earthworks. This enclosure is one quiet casualty of that process.