About ten metres long, it is unassuming to the point of near-invisibility, yet it belongs to one of the most widespread and intriguing categories of prehistoric monument in Ireland. This is a fulacht fia, a type of site found in the hundreds across the country, and whose precise purpose has kept archaeologists arguing for generations.

The typical fulacht fia consists of a horseshoe-shaped or spread mound of fire-cracked stone and charcoal, usually surrounding a trough dug into the ground. The accepted interpretation is that these were ancient cooking sites, where stones heated in a fire were dropped into a water-filled trough to bring it to boiling point, after which meat could be cooked. The technology is simple and effective; experiments have shown that a trough of this kind can be brought to a rolling boil within minutes. Some researchers have proposed alternative uses, from brewing to bathing, and the debate has not fully settled. Most examples date to the Bronze Age, roughly 1500 to 500 BC, though some are earlier or later. The burnt, shattered stones that result from repeated heating and rapid cooling are what form the distinctive mound, accumulating over many episodes of use.