That particular kind of absence, something recorded and then simply gone, is what makes this spot quietly arresting.

The Ordnance Survey's six-inch map of 1838, one of the most detailed cartographic exercises ever carried out in Ireland, clearly shows an embanked enclosure here, roughly 35 to 40 metres in diameter. An embanked enclosure is broadly what it sounds like, a roughly circular or oval area defined by an earthen bank, and such features were common across the Irish landscape for centuries, serving purposes ranging from livestock management to more ceremonial uses. By the time later map editions were produced, the feature had already disappeared from the cartographic record. Today, the flat summit of the ridge, which spans approximately 50 metres east to west and 40 metres north to south, shows no visible trace of it at all. The earth has been grazed smooth, the bank absorbed back into the pasture, and nothing remains to suggest what stood here.

The ridge itself does not sit in isolation. A smaller enclosure occupies the south-western slope below, and roughly 260 metres to the south-south-west there is a rath, the kind of circular earthwork associated with early medieval settlement in Ireland, typically the enclosed homestead of a farming family of some standing. The clustering of these features suggests this part of Mayo was once a more structured and inhabited landscape than the open boggy grassland now implies. The enclosure on the summit, commanding wide views in every direction, may have been the most prominent of them all. What it was for, and why it vanished so completely, remains an open question.