Spread across low-lying grassland in Keekill, this large subcircular enclosure measures roughly 78 metres from north-north-west to south-south-east, and its drystone wall traces an arc from the west-north-west around through north to south-south-east. A gap at the east-north-east looks to be a modern intrusion rather than an original entrance, and a field wall has cut across the monument at two points, so that on the south-western side the enclosing element has all but dissolved into a grassed-over bank, barely distinguishable from the surrounding pasture.

What gives the site its particular interest is the combination of physical evidence and place-name. The townland name Keekill derives from the Irish word for a small early Christian church or cell, and within the eastern sector of the interior there is a clochán-like building, a dry-stone corbelled structure of a type associated with early monastic or ecclesiastical settlements in the west of Ireland. Taken together, the enclosure, the corbelled building, and the name suggest that what was recorded as a "fort" may in fact preserve the outline of an early ecclesiastical site, the kind of modest, enclosed religious settlement that once dotted the landscape of Connacht before the consolidation of the medieval church. The "fort" label, a relic of older map conventions that applied military terminology rather freely to any circular earthwork, has quietly obscured that reading for generations.