Wedge tombs, so called because their gallery narrows and lowers from front to back in a distinctive wedge shape, are the most numerous of Ireland's megalithic tomb types, and Clare has a particularly dense concentration of them. Most date to the late Neolithic or early Bronze Age, somewhere in the range of 2500 to 2000 BC, and they are generally understood as collective burial monuments, though many have also yielded evidence of ritual deposits and repeated use over long periods. That so many survive in the Clare landscape, often on elevated ground or at the edges of bogland, suggests they were positioned with care relative to both the terrain and, perhaps, to one another.