Locally it goes by An Cnocán Glas, meaning roughly "the green hillock", a name that captures how thoroughly it has been absorbed into the everyday landscape of the island. It measures about thirty metres by twenty metres across, and rises to just under two metres in height, modest enough dimensions that a passing walker might not register it as anything more than a slight rise in the ground.

The mound is built of earth and stone, oval in plan, and at least three field walls now run directly through it, one broadly east to west and two running north to south, with further walls closing off its eastern and western limits. That degree of fragmentation makes reading the original structure difficult. During field inspections carried out as part of the AranLIFE Farming Project, which ran between 2014 and 2018 and examined the archaeological and ecological character of the Aran Islands landscape, researchers suggested that the mound may preserve the remains of two conjoined structures. The proposal is that a subcircular mound, open to the south-west, once had a large curving annexe extending from it, sweeping westward in an arc before turning south-east along the ridge line. What that arrangement of spaces was originally used for remains unresolved; the form does not map neatly onto any single monument type, which is part of what makes it worth attention.