No earthwork rises from the grass, no bank or ditch breaks the surface, and a person standing at the spot would have no reason to suspect that anything of significance had ever been there. What remains is essentially a cartographic ghost, preserved in maps rather than in the ground.

A ringfort, or rath, is a roughly circular enclosure defined by one or more earthen banks and ditches, built during the early medieval period as a farmstead or place of habitation for a family of some local standing. The Farranastig example appeared on the Ordnance Survey six-inch map of 1842, recorded as a hachured circular enclosure approximately forty metres in diameter, which is a fairly typical size for a rath of this kind. By the time the same area was mapped again in 1904, part of the southern side had already been removed, and the 1935 revision recorded the same partial survival. At some point after that, the remainder was levelled entirely. The sequence traced across those three surveys is a quietly telling one: a monument that endured for over a thousand years after it was built, only to disappear within a century of first being formally recorded.