This is the most important system in Andalusia with more than 9000 m of topography and one of the largest in Spain, with permanent water, chasms, lakes, siphons and a certain danger due to the fact that the intense rains in the area cause the underground watercourse to vary very quickly, together with the temperature of the water, which has caused the death of several people. It is considered a site of cultural interest, due to its cave paintings, and a natural monument.