NABSQNO 33S-450900-3964235![]() Blue Grotto, Malta Island, Malta Photo by Jay Wilbur NABSQNO 33S-450900-3964235. Blue Grotto is a sea natural arch eroded through Lower Coralline limestone. It is located in the southern cliffs of the island of Malta, and is easily accessed. Blue Grotto has a span of about 30 meters.
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