Field boundaries, whether formed from stone walls, earthen banks, or ditches, can represent some of the oldest continuously used features in the Irish landscape. A boundary that once divided grazing land in the early medieval period, or even earlier, may still be doing the same work today, its original purpose so practical and enduring that it simply never stopped being useful. That continuity is precisely what makes such features worth recording; they are often all that remains visible of a farming system, a land division, or a social arrangement that would otherwise leave no trace.