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마지막 업데이트: 3월 1, 2026
The Source du Doubs is a powerful karst spring in a heavily karstified area of the Jura Mountains. It is located near Mouthe, in the Haut-Jura Regional Nature Park, at an altitude of 937 m at the foot of the wooded, up to 1419 m high Mont Risoux mountain range, which marks the border between France and Switzerland. The Doubs rises from a cave in the rock from a small, approximately five-meter-deep spring basin. The spring discharges an average of 1740 litres per second and is the exit of a complex cave system with several siphons. The discharge can vary greatly. Several layers of rock can be distinguished on the rock above the spring. Below the spring, the river plunges down over a small waterfall. About two kilometers below the Source du Doubs, the approximately nine-kilometer-long Cébriot flows into the Doubs.
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Imposing grotto and at the same time a place of pilgrimage. Here you should switch from the hiking trail near the bridge to the road and pause for a moment and enjoy the gentle coolness and refresh yourself with the water from the Karlsquelle (which is said to have healing powers). A small karst spring arises inside the cave. The water flows as a trickle from a stalagmite into a shallow basin. There is a crucifix under the entrance arch of the grotto, dedicated to Saint Columba of Sens, a 3rd century martyr. The place has been the destination of a pilgrimage on August 15th since the 13th century. The spring water is said to have miraculous healing powers. More: https://de.wikipedia.org/wiki/Grotte_de_Sainte-Colombe
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Lac Vert in Haute-Sorne is a small artificial lake located in the Jura mountains, formed by the Sorne river. It is surrounded by forests and pastures, and offers a beautiful emerald color due to the reflection of the trees. You can enjoy the scenery and the refreshing water of the lake, or continue to the Pichoux gorges for a longer hike. Lac Vert in Haute-Sorne is an ideal destination for trail runners who want to discover the Jura region.
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The Plain-de-Saigne pond is a small artificial lake located in Montfaucon. It's a great place to picnic and admire the reflections of the sky and trees on the water. You can also learn about the history of the lake, which was once home to a mill and peat extraction site.
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Grotto in the rock with many thank you plaques.
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A lovely rest area by a pond (Etang). It's truly one of the highlights of the tour.
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Impressive grotto and pilgrimage site. You should really stop here and enjoy the gentle coolness and fill your bottle with the water from the Karlsquelle (which is said to have healing powers). Inside the grotto, a small karst spring rises. The water flows as a trickle from a stalagmite into a shallow basin. There is a crucifix under the entrance arch of the grotto, which is dedicated to Saint Columba of Sens, a martyr from the 3rd century. Since the 13th century, the place has been the destination of a pilgrimage that takes place on August 15th. The spring water is said to have miraculous healing powers. More: https://de.wikipedia.org/wiki/Grotte_de_Sainte-Colombe
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