Caher Island, lying in Clew Bay off the Mayo coast, is home to a leacht, a term for a low, roughly built cairn or structured heap of stones associated with early Christian devotional practice. Unlike the grander architectural remains of better-known pilgrimage sites, a leacht is easy to overlook; it sits close to the ground, accumulating prayer and purpose rather than height, and is typically visited as a station along a penitential route rather than as a destination in its own right. That quiet quality is part of what makes it interesting.