Sumidors

The Túnel dels Sumidors is a cave with a provisional drop of 205m and a length of about 1300m, the deepest gypsum cave in the world.
The entrance to the cave is located at the base of the Penyó, between the Brolladors and the Saladella. This entrance divides the tunnel into two parts, at the top, about 500m long, and at the bottom, about 800m long. It should be noted that the water inside is hard and salty due to contact with salty rock formations.