A tree-ring, sometimes called a ring plantation, is exactly what it sounds like: a circular or near-circular belt of trees planted not for timber production but for visual effect, intended to be read from a distance as a formal punctuation in an otherwise open landscape.

Such features belong to a broader tradition of designed demesne landscapes in Ireland, where landlords, influenced by English and Continental fashions in landscape gardening, shaped their surroundings to project order, taste, and permanence. Ring plantations were often positioned on rising ground to create eye-catchers, or placed to frame views from a house, to mark a boundary, or simply to demonstrate that the land had been brought under deliberate aesthetic control. The Masonbrook example fits within this tradition, a carefully placed flourish in what would have been a managed estate setting in the west of Ireland.