Reef Watch Monitoring


Koh Tao is surrounded by dense fringing coral reefs and submerged granite pinnacles, with some of the highest coral coverage and biodiversity in the Gulf of Thailand. Our island is one of Asia’s most popular island destinations for snorkeling and we certify more SCUBA divers every year than any other location worldwide. The maintain sustainability, the health of our coral reefs is monitored regularly by the Department of Marine and Coastal Resources (DMCR) and the local dive community. 


By establishing and implementing environmentally-friendly guidelines we can promote sustainable diving and snorkeling practices. By introducing more people to coral monitoring processes, we aim to protect and conserve coral reefs around the island.  


Reef Watch is a simple one-dive-one-survey method to record the health of a coral reef and can be conducted by both divers and snorkelers. Participants record information on an official Reef Watch underwater slate and all data is submitted to officials for analysis and observation. 

Join a reef watch monitoring program! You’ll get a brief on how to monitor coral health and join our team on a snorkeling trip to collect valuable information. The data you collect will help us identify and manage trends so we can continue to develop revitalization techniques that promote optimum coral health. 


3-9 April 2023


Department of Marine and Coastal Resources (DMCR)

Green Fins

Koh Tao Thai Divers Team (KTDT)



South Sairee Reef



Sensi Paradise Beach Resort


Minimum age 18 

Comfortable snorkeling