Placement of symbols not to scale. Not all archaeological sites are identified. The principal fortresses in this period seem to have been Leacanabuaile and Cahergal, indicating the importance of the northern side of the Iveragh Peninsula. It is also likely that the well-known Staigue Stone Fort (i.e., Cathair na Stéige, additional images here) was used by the inhabitants on the southern side of the peninsula, although it likely dates from the 1st century BCE. Also significant on the southern part of the peninsula was Cathair Dónal (from which the present town of Caherdaniel has its name).

The territories of Dairbre and Drong are cited in the Lebor na Cert, and are presented in some instances in conjunction with Corcu Duibhne, and in other passages separately, perhaps indicating that the southern branch of the Corcu Duibhne had already established a distinct identity by the 9th century.

Areas where no raths are located are, in most instances, either lowlands with insufficient drainage for settlement, or more frequently mountainous terrain. The principal monastic settlement in this period was Sceilg Mhichíl (Great Skellig, or Skellig Michael), which fell victim to early Viking raids.