The Source du Lison springs up from a cave at the foot of the cliff. To go inside the cave, make your way under the small tunnel hewn out of the rock, which leads to a platform called the Pulpit (Chaire à Prêcher). After the Loue, this is the most powerful Vauclusian spring in the Jura; at low water the Lison flows at a rate of 600 litres per second, and it is a particularly beautiful sight after rain. The Lison then crosses the charming village of Nans-sous-Sainte-Anne, where it absorbs the Verneau before flowing into the Loue.