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In page Brittany:

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Neolithic Brittany is characterised by important megalithic production and sites such as Quelfénnec, it is sometimes designated as the "core area" of megalithic culture.[3] The oldest monuments, cairns, were followed by princely tombs and stone rows. The Morbihan département, on the southern coast, comprises a large share of these structures, including the Carnac stones and the Broken Menhir of Er Grah in the Locmariaquer megaliths, the largest single stone erected by Neolithic people.[citation needed]