|Location:||Nans-sous-Sainte-Anne, 44 km south of Besançon and 13 km east of Salins-les-Bains.|
|As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
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The Source du Lison (Spring of the Lison) is an impressive karst spring, the resurgence of the Lison river. The river flows out of the portal of a waterfilled cave at the foot of a limestone cliff, the amount of water is huge and may become enormous during spring and after heavy rain. The cave is partly accessible, but not from the spring. Only 50 m behind the spring the roof of the cave is collapsed and forms a huge collapse doline with vertical walls. At the floor of doline flows the water which will re-emerge soon at the spring. There is a trail to an outlook at the rim of the doline.