Grotta dello Smeraldo

The Grotta dello Smeraldo (Italian for "Emerald Grotto") is a cave, partly inundated by the sea and located in Conca dei Marini, Italy, on the Amalfi Coast.

The cave owes its name due to the emerald light that reverberates in it: an underwater fissure allows sunlight to filter through.

Unlike the Blue Grotto, located a few kilometres to the west on Capri, the Grotta dello Smeraldo has no natural outlet above the waterline.

Refracted sunlight entering the cavern through the opening gives the water its characteristic emerald glow during daylight hours.

The absence of a natural opening above the waterline meant that the grotto's existence remained unknown for many years.