This stone ringfort, marked on the first edition Ordnance Survey six-inch map, now appears as a roughly circular enclosure measuring about 36 metres north to south and 30 metres east to west. The original defensive walls have long since collapsed, but their footprint remains clearly defined by the modern field boundaries that follow the same ancient lines.

Today, visitors will find the site enclosed by a contemporary stone wall, built along the path of the original cashel fortification. On the northern side, a grassed-over bank about a metre wide contains loose stones that almost certainly tumbled from the original structure over the centuries. The interior, once home to an extended family group during the early medieval period, is now a flat, grass-covered space set within level pastureland; a peaceful spot that gives little hint of its former role as a fortified homestead.

These cashels, stone-built versions of the more common earthen ringforts, were typical dwelling places for prosperous farming families between roughly 500 and 1200 AD. The Greenhill example, whilst lacking the dramatic presence of better-preserved sites, offers a glimpse into how these ancient structures have been absorbed into the working countryside, their stones recycled into field walls and their defensive purpose long forgotten in favour of more prosaic agricultural uses.