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Beaches in San Sebastián have been closed after an influx of dangerous Portuguese man o' war jellyfish with tentacles up to 30 meters long.

The coast near San Sebastián has experienced a significant invasion of Portuguese man o' war jellyfish, known for their venomous tentacles that can reach lengths of up to 30 meters. This has caused authorities in Spain to close affected beaches as a precaution. Media reports discuss whether the public is overestimating the dangers, but experts emphasize caution due to the jellyfish's potent sting. The situation has generated public concern about beach safety during the season.