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Spain Bans Tourists From Entering Sea as Deadly Creatures Are Spotted

Guardamar del Segura authorities issued a bathing ban after two venomous Glaucus atlanticus specimens appeared, warning swimmers of potential severe allergic reactions and fines for non-compliance.

  • On August 20, Guardamar del Segura mayor Jose Luis Saez confirmed a bathing ban along a seven-mile stretch of Costa Blanca after two blue dragons appeared at Vivers Beach, lasting until further notice.
  • Biology explains the danger: the blue dragon Glaucus atlanticus feeds on Portuguese man o' war, absorbing venomous cells to produce a far more powerful, potentially fatal sting affecting swimmers and holidaymakers.
  • Guardamar del Segura Town Hall launched a preventive operation to detect specimens carried by ocean currents, lifeguards with megaphones warn beachgoers while sunbathers stay on sand, and officials said the red flag could remain for between 12 and 24 hours.
  • On Wednesday, Vivers Beach remained busy despite the ban, with some holidaymakers defying the order and risking hefty fines; meanwhile, six blue dragons were found at Santa Barbara beach, which reopened the next day with a yellow flag.
  • Blue dragons regularly wash up worldwide, and Glaucus atlanticus, dubbed `the most beautiful killer in the ocean`, poses risks that keep coastal communities and tourists vigilant.
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12 Articles

Lean Left

On the Costa Blanca there is a ban on bathing – because of a snail. What sounds harmless carries an invisible danger, which can even cause an allergic shock during contact.

Center

Spanish authorities have banned tourists from swimming on a stretch of the Costa Blanca coast due to the presence of so-called blue dragons - these fascinating, mysterious creatures are so poisonous that they have been nicknamed "the most beautiful killers in the ocean".

·Ljubljana, Slovenia
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Center

On the beaches of the Costa Blanca in Spain, dangerous "Blue Dragons" appeared, whose stings can be fatal. The authorities imposed a ban on bathing.

·Berlin, Germany
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Daily Express broke the news in United Kingdom on Thursday, August 21, 2025.
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