
The underwater world of the Andaman Sea is one of Thailand’s most diverse marine ecosystems. In particular, dive sites featuring blue coral reefs and boulder corals formed along volcanic island landscapes create vibrant and dynamic underwater environments. These unique geological and biological features attract diving enthusiasts from around the world.
Table of Contents
🪸 The Charm of Andaman Sea Corals
🟦 Blue Coral (Blue Coral Reefs)

Blue coral is a fascinating coral species with specialized cells that produce unique compounds, giving parts of its structure a subtle blue hue. While the intensity of the color varies depending on underwater lighting conditions, its distinctive appearance often captures the attention of divers. Blue coral plays a crucial role in reef ecosystems, serving as a “home” for many marine organisms.
⚠️ Note: Corals in the order Helioporacea (which includes blue coral species) are protected under Thai law. Collecting, possessing, or damaging them is strictly prohibited.
🪨 Boulder Corals & Rocky Reefs


Boulder corals and rocky reef systems are commonly found in areas where underwater terrain consists of large rock formations or volcanic seabeds. These structures provide a strong and stable surface for hard corals to grow. They also serve as shelters for schools of fish, juvenile marine life, and various underwater creatures such as shrimp, mollusks, and crabs.
🤿 Diving Experiences at Key Sites
⭐ Blue Coral & Boulder Reef Dive Sites Around Volcanic Islands

On diving trips with Love Andaman, you can explore dive sites that feature:
- Blue coral formations surrounded by diverse marine life
- Rocky underwater structures forming natural reef “corridors”
- Crystal-clear waters that offer excellent visibility of the ecosystem
- A surreal underwater atmosphere that feels like discovering a new world
💡 Tip: The best visibility in the Andaman Sea is typically during the diving season from November to May, ideal for both scuba diving and snorkeling.
🌱 Why Is Marine Biodiversity Important?
Coral reef systems are more than just tourist attractions. They are vital habitats for countless marine species, from small reef fish to larger predators. Coral reefs also help protect coastlines from strong waves and storms, making them extremely valuable to both nature and the coastal economy.
🐡 How to Protect Coral Reefs During Your Trip
To help preserve these underwater ecosystems for future generations:
✅ Use reef-safe sunscreen
✅ Avoid touching or standing on corals
✅ Choose environmentally responsible tour operators
✅ Support local marine conservation efforts
📸 Conclusion
If you love underwater beauty, diving into the world of blue coral and boulder reefs around volcanic islands in the Andaman Sea is an experience not to be missed. Sunlight filtering through clear waters reveals blue-toned coral landscapes and rich marine biodiversity. With Love Andaman, you can explore these natural wonders safely, responsibly, and in harmony with the environment.
