It measures roughly ten metres north to south and fourteen metres east to west, rising only about forty centimetres at its highest point. Beneath that unassuming surface, however, is a dense accumulation of burnt and fire-cracked stone, the characteristic signature of a fulacht fia.

A fulacht fia is a type of prehistoric cooking site found in great numbers across Ireland, particularly in low-lying or waterlogged ground near water sources. The typical method involved heating stones in a fire and then dropping them into a water-filled trough to bring it to a boil. The stones, cracked and spent after repeated heating, were discarded to the side, gradually building up the horseshoe or crescent-shaped mound that survives today. The semi-circular form of the Ahakeera example is consistent with this pattern, and its position adjacent to a stream would have provided the ready water supply the process required. These sites date most commonly to the Bronze Age, though they span a broad range of periods, and their precise function has been debated; cooking is the most widely accepted explanation, though uses ranging from textile processing to bathing have also been proposed.