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Blue Grotto (Biševo)
Blue Grotto (Modra špilja) is a flooded sea cave located on the island of Biševo in the Croatian Adriatic, famous for its glowing blue light phenomenon visible between 11 AM and 12 noon. The 24-meter-long cave receives over 10,000 tourist visits annually and features an artificial entrance built in 1884 to allow boat access to this natural beauty spot.
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Summary
Blue Grotto (Modra špilja) is a flooded sea cave located on the island of Biševo in the Croatian Adriatic, famous for its glowing blue light phenomenon visible between 11 AM and 12 noon. The 24-meter-long cave receives over 10,000 tourist visits annually and features an artificial entrance built in 1884 to allow boat access to this natural beauty spot.
Tags
blue-grotto · sea-cave · croatia · biševo · natural-attraction · adriatic · geology
Key entities
Biševo (location, 0.99) · Croatia (location, 0.99) · Adriatic (location, 0.98) · Komiža (location, 0.95) · Vis (location, 0.95) · Capri (location, 0.93) · Baron Eugen von Ransonet (person, 0.92) · sea-cave (concept, 0.98) · iridescent-blue-light (concept, 0.96) · limestone-erosion (concept, 0.94)
Classification
reference · language en · status final
Provenance
claude-haiku-4-5 via @stacklist/be@0.1.0, confidence 0.85, 11 Aug 2026