Two seas. Hundreds of dive sites. One trip to plan.

Everything you need to plan a dive trip to Thailand: which coast to choose for your dates, the sites worth the boat ride, where to get certified, and how to dive safely.

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Roughly November to April

Andaman Sea

Similan and Surin islands, Richelieu Rock, Phuket, Phi Phi, Koh Lanta and Koh Lipe. Clear blue water, granite boulders and manta rays.

Year-round, best around March to September

Gulf of Thailand

Koh Tao, Sail Rock, Koh Samui and Koh Phangan, plus wreck diving near Pattaya and Koh Chang. The country's main place to learn.

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Thailand

Diving in Thailand: The Complete Guide

Diving in Thailand•Nov 12, 2026

When to go, which coast to pick, the best dive sites, where to get certified, and how to dive safely and responsibly in Thailand.