It is a togher, the Irish term for a bog road or causeway, and this particular example is classified as class 3, a category used by archaeologists to describe a specific method of construction, typically involving longitudinal runners or brushwood laid to provide a firm surface across otherwise impassable terrain.

The Annaghbeg togher was recorded during a field survey in 1988 and published by Barry Raftery in 1990, in work that brought systematic attention to the extraordinary density of ancient trackways preserved in Irish midland bogs. Raftery's surveys documented dozens of such structures, ranging from simple bundles of brushwood to elaborately engineered plank roads, and placed them within a broader understanding of how communities moved through and managed a landscape that was neither fully land nor fully water. The bogs themselves act as remarkable preservatives, and the timbers of tогhers, sealed away from oxygen, can survive for thousands of years in a condition that would be impossible in drier ground.