Grotta Grande del Ciolo is located just a few hundred metres from the famous bay with the same name, a little pebbled cove between the banks of the ravine that drops towards the sea. Wedged into a stretch of coastline marked by deep Pleistocene remodelling, the cave is characterised by a spectacular access by sea and impressive evidence of collapse.
The majestic entrance is more than 30 metres high and opens onto a navigable hall that leads to another hall occupied by fallen rock: by climbing beyond this hall visitors can reach a small lake generated by a fresh water spring and other higher, dry halls where the cave ends.
Of notable paleontological interest are the Middle and Upper Pleistocene deposits found here.