What makes it quietly peculiar is its shape: penannular, meaning almost but not quite circular, like a ring with a deliberate gap, in this case opening towards the south-west. Such a form is unusual for a simple field boundary or agricultural feature, and it places the mound in a category of monument whose precise purpose remains uncertain.

The mound lies within the townland of Cill Mhuirbhigh, a name that reflects its proximity to a cluster of early ecclesiastical remains on the island. Teampall Mac Duagh, the church it neighbours, is associated with Saint Mac Duagh, a figure connected to the broader tradition of early Irish monasticism in the west. The limestone scarp at whose foot the mound sits is characteristic of Inis Mór's geology, where the bare karst terracing of the Burren formation extends out into the Atlantic. The mound itself was recorded at second hand, attributed to the cartographer and writer Tim Robinson, whose meticulous surveys of the Aran Islands brought many overlooked features of the landscape to wider attention. It has not been directly examined by archaeologists, which means its date, function, and full extent remain open questions.