They are karstic formations that are found in the promontory of Capo Caccia. To access it there are two ways: through a staircase of 665 steps that runs along the wall of the Capo Caccia massif, the so-called Escala del Cabriol, or by sea. The cave is over one kilometer longThe boat trip on the river Coghinas will accompany you along the mouth of this river, in a fantastic and invisible from the outside world, along which discover fantastic species and incredible natural pastures, starting from the birds that nest in spring, after their return from the Africa to the marsh tortoises and the endless types of dragonflies.