A circular enclosure in a Kildare field might sound like a modest discovery, but what makes this one quietly interesting is that it remains entirely invisible at ground level. The site at Ballindrum exists only as a cropmark, a ghostly outline pressed into the surface of a growing crop, legible only from the air when differential moisture in the soil causes vegetation above a buried ditch to grow at a slightly different rate than the surrounding field. The enclosure itself is defined by a fosse, which is simply a defensive or boundary ditch, and it carries an additional feature: a smaller enclosure or ring-ditch attached to its south-eastern side.

The site came to light on 13 July 1990, when Dr. Gillian Barrett photographed it during an aerial survey. The resulting image, catalogued as GB90.BT.19, captures the cropmark clearly enough to map the main circular enclosure and its satellite feature. What adds further weight to the location is its immediate surroundings. Within the same field area, the aerial photography also picked up a sub-rectangular enclosure and a large, incomplete curvilinear enclosure nearby, suggesting that this patch of County Kildare preserves traces of a more extensive pattern of ancient activity, the full character and date of which the evidence does not yet pin down. Enclosures of this circular form in Ireland are associated broadly with prehistoric and early medieval settlement and ritual use, though without excavation it is not possible to say more than that about this particular example.