The cave of Saint-Cézaire is a cavity fitted out for tourism, located in the Alpes-Maritimes , 15 km west of Grasse , 2 km from the village of Saint-Cézaire-sur-Siagne . The cave of Saint-Cézaire-sur-Siagne is located in a geological ensemble dating back about 140 million years. This horizon constitutes a thick set of 70 to 170 meters of limestone with a light gray patina, in regular banks often rich in ammonites .
The cave sinks nearly 40 m underground for the part laid out over a course of about 200 m. The main characteristics are: a significant concretion and the presence of iron oxide (red color). For thousands of years, water has carved, gnawed, polished and worked limestone rocks , giving rise to a large number of concretions.