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Between Etel and Penerf rias, passing through the shores of the Carnac plateau, the Quiberon peninsula and the estuary of Auray and Vannes rivers, just over 1.500 submerged monoliths are recorded in Morbihan, divided into 34 sites, all located between 0 and -5 m NGF. In addition to these monumental works, there are some funeral mounds and passage tombs dating from the 7th and 6th millennia BP. This brief synthesis will present the results obtained from submarine domain surveys using various geophysical tools