The enclosure at Glasha Beg measures roughly 56 metres west-northwest to east-southeast and 44 metres north-northeast to south-southwest, dimensions precise enough to confirm this was deliberate, considered work, yet the people who built it left no obvious signature.

What makes Glasha Beg quietly interesting is not the enclosure itself in isolation, but the landscape it sits within. It forms part of an extensive multiperiod field system, meaning the land here was organised, divided, and reorganised across several distinct periods of human activity, the boundaries of one era sometimes overlapping or incorporating those of an earlier one. The enclosure's stone wall is thought to have possibly earlier foundations beneath it, suggesting the current structure may be a later iteration of something older. The surrounding area is dense with cashels and enclosures; a cashel being a stone-walled circular or oval fort, typically associated with early medieval settlement in Ireland. Glasha Beg sits within this broader pattern, one unit within what was once a managed and inhabited upland landscape, now given over to rough pasture and exposed limestone outcrops.