Measuring about ten metres north to south and six metres east to west, it rises only around a quarter of a metre above the surrounding grass. Its opening, some two metres wide, faces south-southwest. This is a fulacht fia, one of thousands of Bronze Age cooking sites scattered across Ireland, and among the most numerous field monuments in the country.

A fulacht fia typically consisted of a trough dug into the ground near a water source, into which stones were heated in a nearby fire and then dropped to bring the water to a boil. The shattered, heat-cracked stones discarded after repeated use are what accumulate into these characteristic horseshoe or kidney-shaped mounds of dark, burnt material. They date broadly to the Bronze Age, though the tradition may span several millennia. The proximity of this example to marshy ground fits the pattern well; reliable access to water was essential to the process, and low-lying, boggy areas provided exactly that. The mound at Gneeves preserves the shape of that ancient activity with reasonable clarity, its opening still oriented toward the south-southwest as it was when the site was last in use.