Enclosures of this type are among the most common yet least understood monuments in the Irish landscape. The term covers a broad range of circular or sub-circular boundaries, typically formed from earthen banks, stone walls, or ditches, that were used across many centuries for purposes ranging from settlement and farming to ritual and burial. What they share is a deliberate act of defining space, of drawing a line between inside and outside, and that act alone gives them a quiet gravity on the ground.