The ringfort that contains it sits quietly in the landscape, circular and compact, its enclosing bank of earth and stone still standing to an internal height of around 1.4 metres. The fort measures just over 32 metres across in both directions, nearly perfectly round, and its interior has been deliberately raised on the eastern side to level out the natural hillslope, a small but telling detail about the care its builders put into the construction. Two gaps survive in the bank, one to the north-east and one to the south-south-east, though it is difficult now to say which, if either, was the original entrance. A fosse, the defensive ditch that would once have run around the outside of the bank, survives in part to the west and north, though that section has been filled in at some point in recent years.

Ringforts, known in Irish as raths when their enclosing element is an earthen bank rather than stone, are among the most common monument types in the Irish countryside, with tens of thousands recorded across the island. Most date to the early medieval period, roughly the fifth to twelfth centuries, and functioned as enclosed farmsteads, the defended homesteads of farming families rather than military fortifications in any grand sense. What gives the Garranes example particular interest is the souterrain recorded in its south-east quadrant. A souterrain is an underground passage or chamber, typically stone-lined, built beneath or adjacent to a ringfort, and used variously for storage, refuge, or concealment. They are a reminder that life inside these enclosures carried an edge of uncertainty, that whatever daily routines played out within the bank, there was always reason to have somewhere to hide.