There is nothing to see at ground level. The enclosure it conceals only becomes legible from the air, and only under the right conditions.

A circular cropmark roughly 35 metres in diameter was picked up on an aerial photograph taken on 15 July 1970. Cropmarks form when buried archaeology affects how overlying vegetation grows; soil disturbed by ancient ditches or banks retains moisture differently from the surrounding ground, and in dry conditions that difference shows up as a variation in crop colour or height, visible from above even when nothing remains below the plough line. The Borrismore enclosure, of the kind once used for settlement or as a ritual boundary in prehistory or the early medieval period, is known only from that single photograph. More intriguing still, a second, smaller enclosure appears immediately to the west, partially overlapping the larger one, suggesting at least two phases of activity on the same spot. A linear field boundary, also detectable as a cropmark, cuts east to west through the northern quadrant of both enclosures, later land division quietly overwriting whatever came before.