Authorities Raise Red Flag Warning after Portuguese Man-of-War Sighting in Krabi

Jinda Srisupphatphong, Director of the Marine National Park Management Division, reported that rangers on routine beach patrols at Mu Ko Lanta National Park found Portuguese man-of-war specimens washed ashore near Laem Tanot. Park officials immediately raised red flags and banned all swimming in the affected area.

On the same day, rangers from Protection Unit PP.7 at Ko Phi Phi Don, under Hat Noppharat Thara–Mu Ko Phi Phi National Park, conducted maritime safety surveys and found more specimens drifting and beaching at Ao Ling and Sam Hat, both popular tourist spots. The park then increased surveillance and issued urgent notifications to tour boat operators and visitors.

​The Portuguese man-of-war (Physalia physalis) is recognizable by its blue or purple gas-filled float, which resembles a Portuguese naval helmet. Its venomous tentacles can extend several meters and remain toxic even after the organism has died or dried on the beach. Contact causes severe burning pain, welts, and damage to the nervous system and cardiac muscle, and can result in respiratory distress, loss of consciousness, or death.

​Park officials have deployed foot patrols and vessels to clear affected beaches. Visitors are advised not to touch specimens under any circumstances, in the water or on shore, and to report sightings immediately to park staff or lifeguards. Beachgoers should wear footwear and avoid entering water in areas marked with a red flag.