That typographic choice is not merely decorative. The OS reserved gothic script for antiquities, places considered old enough or significant enough to warrant a different visual register from the surrounding townland names. Whatever the surveyors made of this earthwork, they judged it worth marking out.

The fort is a ringfort, or the remains of one, a class of monument so common across Ireland that tens of thousands survive in various states of preservation, yet each one retains its own particular character. This example is roughly subcircular, measuring about 33.5 metres northeast to southwest and 28 metres northwest to southeast, and sits towards the top of an east-facing slope on a short spur of land. The stream running through the wooded Milltown Glen lies roughly 110 metres to the northeast, close enough to have been a useful water source. The defining feature is an earthen bank, its base between about five and six metres wide, which rises to an external height of around 1.3 metres on the north-northeast side and reaches 2.3 metres at the south-southwest, suggesting either deliberate reinforcement on the more exposed side or simply the effects of time and gravity working unevenly. There is no visible fosse, the ditch that typically runs outside a ringfort's bank, which either never existed here or has long since silted and grassed over. A narrow entrance ramp, about 1.4 metres wide at its base, opens at the south-southeast.

By 1968 the site had already begun to be reclaimed by vegetation, and subsequent years have not reversed that process. The interior, once a subcircular grass-covered platform, is now overgrown. The name Leary's Fort points to a local tradition of associating the earthwork with a particular family or figure, a common Irish habit of attaching living memory to ancient structures, though who Leary was, and when the name first attached itself to this bank and ramp on a Meath hillside, is no longer recorded.