Diving and Snorkelling in Thailand: A Complete Guide for 2025

Why Thailand Is a Diver’s Paradise

Thailand offers some of the best visibility and biodiversity in Southeast Asia. With warm waters year-round, abundant coral gardens, and countless dive sites for every skill level, it’s a true underwater haven.

Highlights include:

• Encounters with manta rays, whale sharks, and sea turtles

• Affordable PADI-certified dive courses

• Friendly local guides and well-equipped dive shops

• Stunning reefs within national parks and protected zones

📍 Top Destinations for Diving & Snorkelling in Thailand

Here are the best places to explore beneath the surface in 2025:

🐢 Similan & Surin Islands

Located in the Andaman Sea, these islands are protected marine parks known for exceptional visibility, rich coral life, and seasonal whale shark sightings. Open November to May only.

🦈 Richelieu Rock

One of Thailand’s most famous dive sites, Richelieu Rock offers drift diving and pelagic action, including mantas and whale sharks during the high season.

🏝️ Koh Tao & Sail Rock

Ideal for beginners and budget-conscious travelers, Koh Tao is Thailand’s certification capital, while nearby Sail Rock delivers deep dives and giant schools of fish.

🐠 Phi Phi Islands & Koh Lanta

Perfect for snorkellers, with vibrant coral gardens, shallow lagoons, and lively fish just a short swim from shore.

✅ What to Know Before You Dive (or Snorkel)

Before jumping in:

• Always book with a licensed, environmentally-conscious operator

• Never touch coral or marine animals – even accidentally

• Wear a rash guard or reef-safe sunscreen (avoid oxybenzone & octinoxate)

• Bring a waterproof phone pouch or GoPro for stunning underwater shots

• Respect local marine laws – they are enforced!

🔒 2025 Diving & Snorkelling Regulations in Thailand

As of April 2025, new rules apply to protect marine ecosystems. All visitors must comply, especially when entering national marine parks like Similan or Surin.

Key regulations include:

• Life jackets are now mandatory for snorkelling (unless certified in freediving)

• Photography underwater is restricted to experienced divers (Advanced Open Water or 40+ logged dives)

• Maintain a 2-meter distance from coral reefs and marine creatures

• All activities must be supervised by a certified instructor/guide with limited group ratios

• Eco-training or orientation may be required before entry into protected zones

These rules aim to preserve coral reefs, reduce human impact, and ensure safe tourism for all.

🌱 Go Green: Ethical Snorkelling & Diving

Participate in tours aligned with the Green Fins initiative – a UN-backed program promoting sustainable diving and snorkelling practices. Operators under Green Fins:

• Avoid reef contact and harmful chemicals

• Educate guests on marine conservation

• Undergo annual environmental audits

Support those who protect the ocean while giving you an unforgettable experience.

✨ Final Thoughts

Thailand’s underwater treasures are fragile, beautiful, and waiting to be explored. Whether you dream of swimming with sea turtles or hovering above vibrant reefs, doing so responsibly ensures that future generations can enjoy the same wonders. Book with ethical operators, follow the latest rules, and dive into adventure with care.

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