Stone boundaries, worn low by weather and time, mark out divisions that suggest sustained agricultural effort rather than casual seasonal use, which is itself a curious thing on an island that the sea makes difficult to reach even now.

Caher Island is perhaps best known for its early Christian remains, including a small oratory and pilgrimage stations that draw occasional visitors willing to make the crossing from the Roonagh Quay area near Louisburgh. The field system sits alongside these ecclesiastical traces, and the two together hint at a community that was once self-sustaining enough to cultivate the ground as well as tend to its spiritual life. Field systems of this kind, where low stone walls or earthen banks divide land into workable plots, are found across the west of Ireland and often date from the early medieval period, though some have roots stretching back considerably further. On an island of Caher's size and character, the effort involved in constructing and maintaining such boundaries is not trivial, and that effort alone marks the place out as something more than a remote retreat.