Guardamar beaches closed after blue dragon sightings on Costa Blanca

Authorities on Spain’s Costa Blanca have closed a seven-mile stretch of Guardamar del Segura’s beaches after two blue dragons, Glaucus atlanticus, were found in the waters. The local mayor announced that bathing is prohibited while officials conduct a preventive operation to detect any specimens carried by currents. The ban, posted publicly on social media, is expected to remain in place until further notice as authorities monitor the evolving situation.

The blue dragon sea slug is an unusual and striking creature. Weighing only a few centimeters, it preys on venomous species such as the Portuguese man o’ war and other venomous sea life. It stores the captured stinging cells and concentrates their venom, resulting in a sting that can cause nausea, pain and vomiting. Authorities have stressed that despite its bright colour and small size, it should be avoided, and members of the public are urged not to touch the animals, even with gloves.

In Guardamar del Segura, the seven-mile coastline—an area popular with holidaymakers—has been effectively placed under a precautionary watch. The mayor, Jose Luis Sáez, confirmed the shutdown and urged beachgoers to heed the warning flags and...