The example at Platin in County Meath takes that logic inland, using a natural rock outcrop as its foundation. The terrain itself becomes the fortification, with banks and scarps following the edges of the outcrop to define an oval enclosure of roughly two acres, the shape of the land dictating the shape of the defence.

Within that outer boundary, the site holds two further raised areas that suggest something more deliberate than a simple enclosure. A subcircular platform of about twenty-five metres in diameter sits alongside a raised triangular area measuring roughly twenty-nine metres east to west and fifteen metres north to south. The triangular form is unusual; most early Irish enclosures trend towards the circular or oval, reflecting the conventions of ringfort construction, where a roughly circular bank and ditch enclosed a farmstead or high-status dwelling. What these internal divisions meant in practice, whether they separated animals from people, marked a hierarchy of space, or served some other purpose, is not recorded. The rock outcrop setting does place the site in a recognisable tradition of using elevated, defensible ground to signal status or provide security, common across later prehistory and the early medieval period in Ireland.