There are no walls, no earthworks, no visible remains to catch the eye. The only evidence that anything exists here at all comes from the air, where the ground itself gives the secret away through what archaeologists call a cropmark, a phenomenon where buried features affect how grass or crops grow above them, producing subtle differences in colour and height that become legible from above, particularly in dry summers when soil moisture varies over buried ditches or banks.

The enclosure at Ballynash was not recorded on any of the Ordnance Survey's historic mapping, meaning it slipped through generations of conventional survey without detection. It came to light through aerial photography carried out by the Archaeological Survey of Ireland, which identified it as a pennanular-shaped enclosure, meaning it forms a near-complete ring with a break or gap in its circuit rather than a fully closed circle. That pennanular form is one recognised across Irish archaeology in enclosures ranging from prehistoric to early medieval date, though without excavation it is impossible to assign this example to any particular period. Subsequent examination of commercial satellite imagery confirmed the site. Digital Globe orthophotos taken between 2011 and 2013 show an oval cropmark measuring approximately 31 metres east to west and 29 metres north to south, and the same feature is visible on Google Earth images captured in September 2009 and again in April 2015. The record was compiled by Alison McQueen and Vera Rahilly and uploaded to the Archaeological Survey of Ireland database in July 2020.

Because this site exists almost entirely as a cropmark, a visit on foot is a different proposition from most archaeological monuments. There is nothing to photograph from ground level in the conventional sense, and no upstanding feature to orient yourself by. The cropmark is most likely to be visible from above in dry spells during late spring or summer, when soil moisture contrasts are strongest. Anyone with a serious interest in the site would do better to examine the Google Earth historical imagery layers, where the oval outline is clear, than to expect anything dramatic from the field itself. Access would require landowner permission, and the surrounding rough pasture offers little to read without the aerial perspective that revealed the enclosure in the first place.