The Blue Grotto (Italian: Grotta Azzurra) is a sea cave on the coast of the island of Capri, southern Italy. Sunlight, passing through an underwater cavity and shining through the seawater, creates a blue reflection that illuminates the cavern. The cave extends some 50 metres into the cliff at the surface, and is about 150 metres (490 ft) deep.
<a href="//commons.wikimedia.org/wiki/User:Deror_avi" title="User:Deror avi">Deror_avi</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>