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💧 Fosse Dionne – The Mysterious Source of Thunder

A unique and mysterious place, in the heart of Tonnerre.

In the heart of Tonnerre, the Fosse Dionne is one of the city's most iconic sites.

This karst spring, whose depth is still partially unknown, has intrigued people for centuries. Its circular basin, surrounded by an 18th-century wash house, offers a unique and photogenic setting. The water sometimes takes on astonishing hues, depending on the light and the season.


Accessible on foot from Camping La Cascade, the visit can easily be combined with a walk in the historic centre.

📍 On foot from the campsite


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Fosse Dionne – visit near Tonnerre (Burgundy Canal, Yonne)
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