Source du Lison, grotte dans le Doubs, France
Source du Lison is a natural spring in Nans-sous-Sainte-Anne where clear water emerges from limestone rock. The water flows steadily from this point and feeds the Lison river as it winds through narrow gorges and green forest.
The spring once powered small mills and served household needs in earlier times. Exploration of the underground network revealed a labyrinth of caves connected to the source, shaping how people understood the water system.
The spring is a place where water returns to the surface from underground, known to local people for generations. Stories tell of water collection and social gathering spots that villagers used long ago.
The site is easy to reach by a small road from the village with parking available nearby. Visitors should stay on marked paths as loose stones and falling rocks are possible in the area.
Mineral deposits such as tufa formations create stepped structures around the spring where water loses pressure and minerals remain behind. These formations build small cascades and pools as water flows over the buildup.
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