The enclosure at Erneen sits in rough hill pasture, tucked into a sheltered hollow, and what makes it worth pausing over is the texture of its construction: a single boulder, four metres long, has been incorporated directly into the northern arc of the drystone wall, with contiguous stone slabs continuing the line around to the south-east. Drystone construction uses no mortar, relying entirely on the careful fitting of stones, and here the builders worked an existing feature of the landscape into the fabric of the structure rather than working around it.

The enclosure is oval in plan, measuring just under ten metres east to west and nearly seven metres north to south. The wall, now largely collapsed, originally stood to around 0.8 metres and was roughly half a metre thick. The interior is level ground. What gives the site its particular character is what clusters around it: three hut sites adjoin the enclosure on its south-western to south-eastern exterior, suggesting that this was not an isolated or purely functional boundary but part of a small settlement arrangement, people living immediately alongside whatever activity the enclosure was meant to contain or protect. A relict field boundary, one of those faint earthwork lines that mark out a former agricultural landscape now given over to open pasture, terminates close by, hinting at a system of land use that once organised this hillside in ways now largely erased.