It can only be seen from above, and even then only under the right conditions: the outline emerges as a cropmark, a faint difference in vegetation colour and growth caused by a buried fosse, a defensive ditch, running beneath the soil. The enclosure measures roughly 60 metres on its north-east to south-west axis and about 45 metres across, with the fosse itself estimated at around 2 metres wide. No earthwork survives at the surface. The entire thing exists, for practical purposes, as a shadow in a satellite image.

The site was first identified by Simon Dowling, who noticed the cropmark on Google Earth imagery captured on 14 July 2018. Cropmarks of this kind typically appear during dry summers, when soil moisture is uneven and plants growing over a buried ditch, which retains more moisture than the surrounding ground, remain slightly greener or grow slightly taller than their neighbours. The oval shape and the scale of this enclosure are consistent with a ringfort or enclosed settlement of early medieval date, though without excavation that classification remains tentative. Oulart Hill itself carries its own considerable historical weight, being the site of a significant engagement during the 1798 rebellion, but this enclosure, tucked towards the upper slope at Glenranny, belongs to a much older and quieter layer of the landscape.