Azzurra Cave in Ustica
The Blue Grotto and the Grotta di San Francesco di Ustica are part of a single complex formed by two caves communicating through an internal tunnel.
In the Blue Grotto the light rays that manage to penetrate inside give rise to a spectacular game of lights and colors.
The Blue Grotto is made up of a large room with a diameter of 30 meters from which two branches branch off which are divided into various sections and rooms.
It is possible to access the Blue Grotto from the sea through a large entrance or from the partially submerged tunnel on the left, which connects the cave with the cave of San Francesco.