Blue Button jellyfish shut Similan beach zone

2026-02-23 - 04:23

PHANG NGA — 23 February 2026, Mu Ko Similan National Park has warned visitors after Blue Button jellyfish were found along parts of the shoreline in designated swimming areas, particularly on the eastern side (Hat Na) of Island No. 4. The marine creatures are bright blue, with a distinctive round, button-like disc at the centre and numerous tentacles surrounding the body. They typically drift with currents and are blown ashore. Although their venom is less severe than that of box jellyfish, contact can cause an immediate burning or stinging sensation, red rashes, swelling, itching or small fluid-filled blisters. Even when stranded on the beach, they can still irritate the skin and should not be touched directly. For first aid, officials advise rinsing the affected area with seawater. Fresh water should not be used immediately, and the wound should not be rubbed. Any remaining tentacles should be carefully removed. Those experiencing severe pain, spreading rashes or unusual symptoms should alert park officials at once. The park has temporarily closed the eastern swimming zone (Hat Na) on Island No. 4 until conditions are deemed safe. Visitors who encounter the jellyfish elsewhere are urged to inform officials immediately and to follow all safety instructions strictly.