The fourth side is absent, or at least no longer legible, but what remains, running roughly north-west to south-east along one axis and east to west along the other, measures approximately 24.5 metres by 17 metres. It is the kind of site that a person could walk across without registering it as anything other than a slight unevenness in a field.

Enclosures of this type are a common feature of the Irish ecclesiastical landscape. A roughly rectangular or curvilinear boundary bank surrounding a small sacred precinct, often with a chapel or oratory inside, was the standard arrangement for early Christian religious sites, particularly those associated with local saints or minor monastic foundations. At Glinsk, a chapel did stand within the interior, though little detail survives about its form or the community it served. The enclosure bank survives in fair condition along its southern, western, and northern sides, suggesting the site has not been heavily disturbed, even if the chapel itself has long since disappeared or reduced to foundations.