A fulacht fiadh is a type of prehistoric cooking site, typically Bronze Age, where water in a trough was heated by dropping fire-cracked stones into it. The broken, angular limestone fragments that make up this mound fit that pattern well enough, as does the hollow at its centre, which opens towards the east-northeast. But without the spring, stream, or boggy hollow that almost always accompanies such monuments, the identification remains tentative.

The mound sits on a narrow limestone terrace roughly 340 metres west-southwest of Teampall na Naomh, a medieval church on Inis Meáin in the Aran Islands. Locally it is known as An Cnocán Glás, meaning roughly the green hillock. The structure measures about 21 metres along its longer axis and stands 1.7 metres at its highest point, with a small upright stone placed at the western end of the central hollow. The name and the personal communication attributing it were recorded by Tim Robinson, whose meticulous mapping of the Aran Islands and Connemara through the 1970s and 1980s brought dozens of overlooked features like this one into the documentary record. The site was noted and assessed in 1980.