The enclosure at Bawnoge is invisible at ground level, its outline legible only from the air, where it emerges as a cropmark, a phenomenon that occurs when buried ditches and earthworks cause the vegetation above them to grow differently, producing faint discolourations that become readable in aerial or satellite photography.

What the imagery reveals is a roughly D-shaped enclosure of considerable size, measuring approximately 71 metres on its shorter north-west to south-east axis and a striking 542 metres along its longer north-east to south-west span. An entrance gap some 8 metres wide is visible at the northern side. Along the south-western edge, a roughly straight length of ditch, running about 71 metres, appears to extend beyond the enclosure itself, suggesting it may once have been part of a field boundary rather than a purely structural element of the monument. What purpose the enclosure served, and when it was constructed, remains unresolved; its scale alone makes it unusual, well beyond the dimensions of a typical early medieval ringfort. Adding to the interest of the site, two ring-ditches, the circular earthwork remains most commonly associated with prehistoric burial monuments, lie just 4 metres to the south-south-east, hinting at a longer and more layered history of activity in this landscape. The site came to wider attention through aerial analysis of Google Earth imagery, and was formally recorded based on work by Simon Dowling and Robert Hanbridge.