The Sarrazine Cave, also called "Manteau Saint-Christophe" in Nans-Sous-Sainte--Annee, opens onto a cliff 140 meters high. At the foot of a huge porch of 90 m including 40m overhanging, a resurgence, sometimes violent, pours its waters into the nearby Lison. The source of the Lison is only a few hundred meters away. Due to the sudden rise of the waters, the cave still keeps many secrets for speleologists whose caution is advised.