Extending from Myanmar down past the west coast of Thailand to beyond the Malaysian border, the Andaman Sea forms part of the Indian Ocean. Many of the 155 islands in the Andaman Sea are uninhabited (apart from communities of Chao Ley – ‘sea gypsies’), and are crowned by lush primary vegetation tumbling down to a shoreline punctuated by idyllic sandy beaches.

Most of the diving in this region is organized from the popular holiday island destination of Phuket, with a wide variety of operators offering recreational and technical training, day trips, and liveaboard options. The best time for diving is between October and May.

In general the Andaman Sea has more extensive coral reefs but similar visibility to the Gulf of Thailand, with most of the reefs around the offshore islands occurring on the east sides of the islands, due to the influence of the southwest monsoon; the west coasts tend to have rocky slopes descending to 10-30m in depth.

Towards the northern end of the Thai coastline, a series of granitic outcrops lie in deep, clear water with reefs descending to 25-30m and beyond in depth. These are the Similan and Surin Islands, whose breathtaking underwater scenery and great diversity of marine life have gained them a considerable reputation in the diving community.

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