At Farrancallin in County Westmeath, a rath sits on a gentle north-easterly slope in open grassland, and a second ringfort lies roughly 200 metres to the west-northwest. The two were near-neighbours in whatever era they were occupied, and the land between them is flat enough that each would have been visible from the other.

A rath, to use the Irish term, is a ringfort defined by earthen rather than stone construction, typically a raised circular enclosure bounded by a bank and, sometimes, a shallow external ditch called a fosse. They are among the most common archaeological monuments in Ireland, associated broadly with the early medieval period, though the precise dating of any individual example is rarely straightforward without excavation. The Farrancallin example measures approximately 35 metres north to south and 34 metres east to west, making it a fairly typical size. Its earthen bank is most substantial on the southern and western arc, where it retains a clear profile, while elsewhere it has been reduced to a simple scarp, a low slope rather than a defined bank. A slight depression about 1.2 metres wide in the south-eastern scarp suggests a possible original entrance, which is a common position for ringfort entrances. Just outside this point there is a large feature interpreted as a possible quarry hole, which may have supplied material for the bank itself. A modern field fence cuts across the monument at the north-northwest, the kind of agricultural intrusion that affects many such sites across the country and is a useful reminder of how much of Ireland's early medieval landscape survives only partially, sliced through by later boundaries.