Pierre-Paul Riquet surprises us again with a round lock built with three exits. Thus, with a simple rotation boats can choose any direction they want.
One towards the Thau basin and Séte another toward Herault and the last exit to the Mediteranean sea.
Altered slightly in the 70 by the authorities to let work begin on adapting the canal to the Freycinet gauge , it is no longer round.
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