An arrangement of single or multiple rows of standing stones (menhirs) at a site once occupied by humans. They are found mainly in Brittany and the British Isles' highland zones and are often aligned on cairns, henge monuments, or stone circles. Some others are found in Corsica. The rows do not provide much dating evidence, but they were probably set up in the 2nd and 3rd millennium BC (Neolithic, Bronze Age).