That absence makes it quietly significant. The enclosure at Treanmanagh was brought to light not by a ground survey or an archival discovery, but by an aerial photograph taken during the Bruff aerial photographic survey in 1986, when the cropmarks and earthwork shadows that can only be read properly from above finally gave it away.

The survey image, catalogued as Bruff 148 AP 4/3625, recorded the enclosure as a roughly rectangular feature with external dimensions of approximately 13 metres on its northeast to southwest axis and 17.5 metres on its northwest to southeast axis. Enclosures of this kind are a broad category in Irish archaeology, ranging from early medieval farmstead boundaries to features with prehistoric origins, and without excavation it is difficult to assign a firm date or function to any individual example. What the record does confirm is that the site sits about 500 metres east of the townland boundary with Derk, on poorly drained land that was at some point reclaimed for pasture. The enclosure has since been verified through multiple remote-sensing sources: an Ordnance Survey Ireland orthoimage from 2005 to 2012, Digital Globe orthoimages taken between 2011 and 2013, and a Google Earth image captured in November 2018. The record was compiled by Edmond O'Donovan and uploaded to the national monuments database in September 2020.

The site is not accessible in any formal sense, and there is no signage or path leading to it. Because the enclosure lies on private farmland and its visibility depends heavily on lighting angle and seasonal vegetation, the feature is essentially meaningless at ground level to an untrained eye. The most useful way to engage with it is through the aerial and satellite images referenced in the monuments record, where the rectangular outline becomes legible against the surrounding grassland. Those visiting the broader Bruff area who have an interest in landscape archaeology may find it worthwhile to cross-reference the 1986 survey image with a current satellite view, if only to appreciate how much of what we know about sites like this one was invisible until someone thought to look from above.