The particular site here is a low, partially overgrown circular mound of burnt material, just 7.7 metres across and barely 0.1 metres high, easy to miss entirely unless you know what you are looking for.

A fulacht fia is the remains of a Bronze Age cooking place, typically found near water or boggy ground. The method involved heating stones in a fire and then dropping them into a water-filled trough to bring the water to a boil. The spent, fire-cracked stones were piled to the side over time, gradually building the characteristic horseshoe or rounded mound that survives today. The material underfoot at Aglish is the debris of repeated use, charcoal and shattered stone compacted into a gentle rise that the surrounding marsh vegetation is steadily reclaiming. What makes this site particularly notable is simply its company: three further fulachta fiadh occupy the same field, suggesting this low-lying area was a place of regular, perhaps communal, activity over a long stretch of prehistoric time. Whether that concentration reflects seasonal gatherings, a particularly reliable water source, or something else entirely, is not recorded.