The Amalfi's coast il rich of Caves, built through the water erosion on the calcareous rocks.

Between these caves, there is one, called "Grotta dello Smeraldo", that has typical karst and marine caves element.

 In the beginning the cave was above the sea and, during this age,  stalactites and stalagmites took shape.

Slowly, when the sea level rised on the coast, the cave was partially flooted up by the sea.

Today, the cave is connected to the sea through an tunnel 12 mts long and at 4 mts deep.