It was not found by accident, or by a farmer's plough, or by an antiquarian with a theory. It was found by geophysical survey, the kind of systematic, instrument-led investigation that reads the ground like a faint signal, and it only came about because a road needed realigning.

The survey, carried out under licence number 07R0230 ext. and reported by Harrison in 2008, revealed the enclosure sitting on the south-facing slope of a low east-to-west ridge at Drumnigh. Enclosures of this type, roughly circular earthwork or ditched boundaries, are among the most common archaeological features in the Irish landscape, and they range widely in date and function, from early medieval ringforts used as defended farmsteads to prehistoric ritual sites. What gives this one particular interest is its relationship to its surroundings. Just 27 metres to the south lies a second enclosure, already recorded in the Sites and Monuments Record as DU015-118. Two enclosures in such close proximity suggest this ridge carried some sustained significance, though whether they were contemporary with one another is not yet known. Inside the newly identified enclosure, the survey detected responses consistent with pits and postholes, the buried traces of structural activity, pointing toward occupation or settlement of some kind rather than a purely ceremonial use.

There is nothing to see at ground level, which is rather the point. Drumnigh is a quiet area to the north of Dublin city, and the enclosure sits in a landscape that has seen considerable change from modern development and road infrastructure. For anyone with an interest in how archaeology works rather than just what it produces, this site is a useful case study in what geophysical survey, which measures variations in soil resistance or magnetism without disturbing the ground, can reveal before a single sod is lifted. The proximity of two enclosures on the same ridge is the kind of detail that tends to get lost when sites are catalogued in isolation, and it is worth knowing that the landscape here may be considerably more layered than its present appearance suggests.