The structure there is a promontory fort, a type of defensive enclosure that makes use of natural geography in a characteristically Iron Age manner: where a finger of land juts out into the sea, a builder need only construct a rampart or ditch across the narrow landward neck to create a stronghold with water guarding three sides. The sea cliffs do the hard work; the human effort is concentrated into that single barrier facing inland.

Promontory forts of this coastal type are found at intervals all around the Irish seaboard, and while their precise dates of construction vary, many belong broadly to the Iron Age or early medieval period. They are thought to have served various purposes depending on the site, whether as refuges, the enclosed compounds of local elites, or places connected with seasonal activity and the keeping of livestock. The Sligo coastline, with its mix of exposed Atlantic headlands and sheltered bays, offered obvious candidates for this kind of fortification. Kilkilloge sits within that broader coastal geography, though the specific details of this particular fort, its dimensions, the character of its rampart, any finds associated with it, remain to be fully documented in the public record.