Blue button jellyfish close Similan beach to swimmersBlue button jellyfish are 2-3cm across, and have tentacles that can deliver a painful sting. (Photo: อุทยานแห่งชาติหมู่เกาะสิมิลัน - Mu Ko Similan National parkPHANG NGA - A public safety warning has been issued after blue button jellyfish were found along parts of the shoreline at Princess beach and in other areas of the Similan Islands National Park. While their venom is less severe than that of the box jellyfish, contact can cause an immediate stinging or burning sensation. They are also smaller, 2-3cm across, and their stings less painful than the bluebottle jellyfish that often appear at Thai beaches. As a precautionary measure, the swimming zone along Princess beach has been temporarily closed until conditions are deemed safe.

Source: Bangkok Post February 23, 2026 10:23 UTC