Red Seawater Phenomenon Reported at Laem Panwa Beach, Phuket
Authorities have issued a warning for tourists to avoid swimming at Laem Panwa Beach in Phuket following a plankton bloom that turned the water reddish-brown.
On November 14, 2026, officials from the Marine and Coastal Resources Research and Development Center investigated reports of discolored seawater at Laem Panwa Beach in Phuket. According to Khaosod Online, the water had turned a reddish-brown hue, stretching approximately 150 meters along the coastline. Preliminary findings indicate that the discoloration was caused by a bloom of Alexandrium sp. plankton. During the inspection, water temperatures were recorded between 32.4 and 32.9 degrees Celsius, with salinity levels at 30–31 parts per thousand, a pH range of 8.24–8.36, and dissolved oxygen levels between 9.7 and 12.5 milligrams per liter. While no immediate impact on marine life was observed, authorities have advised the public and tourists to refrain from swimming or coming into contact with the water in the affected area to prevent potential skin irritation. Officials are continuing to monitor the situation and are conducting further laboratory analysis to determine nutrient levels and assess the long-term environmental impact. Travelers are encouraged to follow local guidance and avoid the water until further notice.
