According to the speleologists of the Doubs, the well of the Citadelle is the deepest of France, in front of that of the Halle at Cordes-sur-Ciel in the Tarn (114m).
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According to the speleologists of the Doubs, the well of the Citadelle is the deepest of France, in front of that of the Halle at Cordes-sur-Ciel in the Tarn (114m).