Fosse Dionne

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La fosse Dionne - the karst spring located in the center of Tonnerre, France.

Some 200L of water per second gush this natural spring that was sacred to the Celts and whose vivid blue-green tint hints at its great depth. Legend has it that a serpent lurks at the bottom. Forming a picturesque backdrop behind the great circular pool are a mid-18th-century washing house, a semicircle of ancient homes and a steep forested hillside.

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