Bue Marino Cave
The name comes from the presence of Monaca seal, the extremely rare Mediterranean seal (that local people call "sea ox", Bue Marino), which till to the '80ies came to grow its puppies in this cave.
Today the caves are available for guided tourist visits: from Cala Gonone some boats go to the mouth of the cave, opening at sea level in a huge precipitous sea cliff.
Here the visitors follow, walking on some flying bridges, the way the sea penetrates into the mountain creating a salt lake of more then 1skm of surface: the place is highly suggestive and very rich of stalactites and stalagmites.
The path ends where the sea finishes and joins its waters with the ones of the underground river, though the cave is very long, only underwater speleologists may go further...
Equally interesting and suggestive is the northern branch of the cave, by now fossil (water has naturally abandoned it and stalactites ceased to grow), that can be visited only with an authorization. Some local cooperatives organise speleologist excursions into the different branches of the cave.