Jisho

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洞窟 ()
Wikipedia definition
1. Blue Grotto (Capri)The Blue Cave is a noted sea cave on the coast of the island of Capri, Italy. Sunlight, passing through an underwater cavity and shining through the seawater, creates a blue reflection that illuminates the cavern.
Read “Blue Grotto (Capri)” on English Wikipedia
Read “青の洞窟 (カプリ島)” on Japanese Wikipedia
Read “Blue Grotto (Capri)” on DBpedia

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